Periodic table cbse 10.
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Periodic classification of elements has evolved over time as more elements were discovered and properties were better understood. Early classifications by D旦bereiner and Newlands grouped elements with similar properties but had limitations. Mendeleev's periodic table of 1869 arranged elements by atomic mass and predicted properties of undiscovered elements. Later, Moseley showed atomic number better explained trends in properties. The modern periodic table arranges elements in rows by increasing atomic number and columns by similar outer electron configurations, allowing prediction of trends in atomic size, valency, metallic/non-metallic character across periods and down groups.
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4.1
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1. The modern periodic table evolved over time through the work of multiple scientists in the 19th century who organized the known elements in different ways.
2. Mendeleev published one of the first recognizable periodic tables in 1869, arranging elements by atomic mass and leaving spaces for undiscovered elements.
3. Mendeleev's predictions about three unknown elements were later confirmed, supporting his periodic law and establishing him as the father of the periodic table.Newlands octaves
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John Newlands developed the Law of Octaves in 1866 which stated that elements had similar properties every eighth element, like the octaves in music. He arranged the 56 known elements in his octave table. The Law of Octaves worked well for lighter elements but failed for heavier ones discovered later. Dimitri Mendeleev later developed the periodic table, which became the accepted system for classifying elements by properties and arranged by atomic mass. The periodic table was later corrected by Henry Moseley in 1913.Periodic table timeline 
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- In 330 BC, Aristotle proposed the four element theory of earth, air, fire, and water. In 360 BC, Plato coined the term "stoicheia" meaning elementary principles of the world. In 440 BC, Democritus and Leucippus proposed the idea of atoms as indivisible particles that all matter is made of.
- Major developments in chemistry included Boyle's publication of "The Sceptical Chymist" in 1661, which described atoms, molecules, and chemical reactions and is considered the beginning of modern chemistry. Joseph Black isolated carbon dioxide in 1754 and Henry Cavendish discovered hydrogen in 1766.
- John Dalton proposed "Dalton's Law" in 1803 describing thePeriodic table
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The document discusses the development of the periodic table. It describes how early scientists like D旦bereiner proposed organizing elements into groups and Newlands proposed the law of octaves. Meyer and Mendeleev further developed methods of classifying elements based on their atomic properties. Mendeleev is credited with creating the first periodic table in 1869, arranging elements in order of atomic mass and predicting properties of undiscovered elements. The periodic table is characterized by vertical groups numbered I to VIII and horizontal periods that vary in the number of elements they contain from 2 to 32.Periodic table of_elements
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This document summarizes the history and development of the periodic table. It discusses early scientists like Lavoisier who first classified elements, Dobereiner who grouped elements into triads, and Newlands who saw a periodic pattern. Meyer and Mendeleev created early periodic tables that grouped elements by properties and left spaces for undiscovered elements. Moseley later determined that atomic number, not mass, was the basis for the recurring properties and rearranged the periodic table accordingly. The modern periodic table arranges elements in order of increasing proton number, with elements of similar properties in the same group and period based on electron configuration.Devi
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The document discusses the early history and development of the periodic table. It mentions that Antoine Lavoisier was the first to classify elements into groups in 1789. John Dalton formulated the atomic theory in 1808, proposing that atoms of each element have a fixed mass. D旦bereiner classified elements into triads based on similar properties. Mendeleev arranged elements in order of atomic mass and published the first periodic table, which provided a foundation for the systematic study of chemistry. He also proposed the modern periodic law and modified the periodic table based on increasing atomic number.Science revision
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This is a powerpoint which may help a few students revise. It has a few key science subjects. I explained the subjects in detail to help students understand.5.6 History of the Periodic Table
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Mendeleev organized the periodic table by arranging elements in order of increasing atomic mass, which allowed elements with similar properties to line up in regular intervals. Some inconsistencies remained unresolved until Moseley discovered that arranging elements by atomic number eliminated all inconsistencies. The periodic table continues to be refined, with the addition of noble gases in the 1800s and recognition of lanthanide and actinide series in the 1900s. The periodic law states that when elements are arranged by atomic number, their chemical and physical properties repeat periodically.Chemistry
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Chemistry is a branch of science that studies the composition, structure, properties and transformations of matter. It is concerned with atoms and molecules and their interactions. An atom is the smallest unit of matter and contains a nucleus of protons and neutrons. The properties of chemical bonds between atoms create chemical compounds.
Early chemists worked to develop classification schemes to organize the known chemical elements. In 1789, Lavoisier published a list of 33 elements grouped into gases, metals, nonmetals and earths. Throughout the 19th century, chemists like D旦bereiner, Gmelin and Dumas observed relationships between elements and tried to build a single comprehensive scheme, but had not yet succeeded in encompassing all elementsPeriodic table
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The document discusses the periodic table. It defines the periodic table as the tabular arrangement of chemical elements based on their atomic numbers, with vertical columns called groups and horizontal rows called periods. Properties of elements are periodic functions of their atomic numbers. The modern periodic table is based on the periodic law proposed by Henry Moseley. While scientists proposed various early forms, Dmitri Mendeleev developed the renowned 1869 periodic table that was systematically devised with empty cells for missing elements. The modern periodic table contains 118 total elements, with 94 naturally occurring on Earth and the rest synthetic.Periodic Table C P
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The document outlines the early discoveries that led to the development of the periodic table, including Dobereiner's discovery of triads of elements with similar properties, Newlands' law of octaves noting patterns every eighth element, and Mendeleev and Meyer independently publishing the first periodic tables and Mendeleev's improvements by leaving gaps for undiscovered elements. It concludes with Moseley arranging the elements by atomic number instead of atomic mass, establishing the concept of atomic number and the periodic law that the properties of elements are periodic based on their atomic number.Welcome @
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1) The document discusses the early attempts to classify elements, including Lavosiere's classification of metals and non-metals, and Dobereiner's classification of elements into triads based on similarities in atomic mass and properties.
2) It then describes John Newlands' law of octaves, where he observed that elements arranged by atomic mass had repeating properties every eighth element.
3) The main focus is on Mendeleev's periodic table, where he arranged elements by atomic mass and was able to predict properties of undiscovered elements, establishing the periodic law that properties repeat periodically with increasing atomic mass.
4) The modern periodic table arranged by atomic number rather than mass is then discussed, with MUnit b matter and chemical change notes(history of periodic table)
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The document discusses the history of organizing the elements in the periodic table. It describes the key parts of an atom and size comparison to everyday objects. Early chemists used symbols of the sun and planets to represent seven metals. By the early 1800s, over 30 elements had been identified. John Dalton developed new element symbols using capitalized first letters. Johan Berzelius suggested two letters if elements shared the first. Dmitri Mendeleev organized 63 known elements by properties into the first periodic table in 1869, grouping elements with similar properties in columns.Welcome @
Welcome @Aryaprasadsntc
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- The document discusses the early history and development of the periodic table, from early attempts at classification by Lavoisier and Dobereiner to the establishment of periodic law by Mendeleev.
- Mendeleev arranged the elements in order of atomic mass and was able to predict properties of undiscovered elements, establishing the basis for the modern periodic table.
- Moseley later modified the periodic law to state that properties depend on atomic number rather than atomic mass, bringing the periodic table to its modern form.Periodictable
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The document summarizes the development of the modern periodic table by key scientists from the 19th and 20th centuries. Johann Dobereiner first classified elements into triads in 1817 based on similarities in properties. John Newlands proposed the Law of Octaves in 1869, arranging elements by atomic mass. Dmitri Mendeleev published the first recognizable periodic table in 1869, arranging elements by atomic mass and leaving spaces for undiscovered elements. His predictions based on the table were later verified. Moseley determined atomic number to be the fundamental property in 1913. Seaborg moved elements below the lanthanides in 1944 to form the actinide series. The modern periodic table arranges elements by increasing atomic number andHistory of periodic table
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The document summarizes the history and development of the periodic table. It describes early models proposed by Dobereiner, Newlands, and Meyer. It explains that Mendeleev is considered the "father" because he left gaps for undiscovered elements and his predictions were later verified. The table became more accurate when Moseley determined elements were arranged by atomic number instead of mass. Later discoveries by Seaborg expanded the table with new elements.keplers laws
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The document outlines Johannes Kepler's three laws of planetary motion:
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Dmitri Mendeleev created the periodic table in 1869 as an organized way to show the known elements arranged by atomic number and their chemical and physical properties. The periodic table organizes elements into rows and columns called periods and groups based on their valence electrons and similar atomic orbitals within the same period. Examples provided are hydrogen which can power cars, oxygen which is necessary for breathing, and helium which is used to inflate balloons.Periodictable2
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The document summarizes the key developments in the periodic table. It describes how elements are organized in the table based on their atomic number and properties. Early scientists like Dobreiner grouped elements based on similar properties, while Mendeleev arranged them by atomic mass. Later, Moseley determined that arranging by atomic number best showed the periodic repetition of properties, which became known as the Periodic Law.Periodictable2
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The document summarizes the key developments in the periodic table. It describes how elements are organized in the table with atomic numbers and weights. Early scientists like Dobreiner grouped elements by properties into triads. Mendeleev arranged the table by atomic mass, but Moseley correctly identified atomic number as the fundamental property through his work with X-rays. The modern periodic table arranges elements by increasing atomic number according to the Periodic Law of repeating physical and chemical properties.Periodictable2
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The document summarizes the key developments in the periodic table. It describes how elements are organized in the periodic table with their chemical symbols, atomic numbers, and atomic weights. Early scientists like Dobreiner grouped elements based on their properties. Mendeleev arranged the elements in order of increasing atomic mass. Later, Moseley determined that elements should be ordered by their increasing atomic number. The periodic law states that elements' physical and chemical properties repeat periodically when arranged by atomic number.Periodic table
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The periodic table, also known as the periodic table of chemical elements, is a tabular display of the chemical elements. It used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry. Basic concepts of modern periodic table
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The document provides an overview of the periodic table including its development, characteristics, and positioning of elements. It discusses:
- There are 118 known elements placed in the periodic table based on their electronic configurations. Metals lie on the left side and non-metals on the right, separated by metalloids.
- The horizontal rows are called periods and there are 7 periods. Elements in the same period have consecutive atomic numbers. The vertical columns are called groups and elements in the same group have similar properties despite having different atomic numbers.
- Noble gases are placed on the far right. Early periodic tables were arranged by atomic mass but Mendeleev organized his 1871 table based on properties, allowing prediction of unknownChapter 6.1
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Early attempts to organize elements included grouping them into triads based on similar properties or by increasing atomic mass, seeing a periodic pattern. The modern periodic table arranges elements by increasing atomic number, reflecting a periodic repetition of physical and chemical properties. Elements are classified as metals, nonmetals, or metalloids based on their general conductive properties and whether they are solids, gases, or have properties in between.Periodic classification of elements
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The document discusses the history and development of the periodic table. It describes early classification systems by Dobereiner, Newlands, and Meyer that recognized patterns in element properties but had limitations. Mendeleev created the first successful periodic table in 1869 by arranging elements by atomic mass and leaving gaps for undiscovered elements. Moseley established in 1913 that atomic number, not mass, is fundamental; the modern periodic table is based on atomic number.Historical development of periodic table
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THIS PRESENTATION IS BASED ON THE CONTRIBUTION OF DIFFERENT CHEMIST IN CREATING THE PERIODIC TABLE .IT WILL HELP THE LEARN THE VARIOUS MERITS AND DEMERITS OF VARIOUS METHODS OF CLASSIFYING ELEMENTSClass 10. Chapter 5. Periodic Classification of Elements
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This document summarizes key concepts from Chapter 5 on the periodic classification of elements:
1. Early scientists like Dobereiner and Newlands attempted to classify elements based on their properties but their systems did not comprehensively explain the trends.
2. Mendeleev organized the known elements into the first periodic table based on their atomic masses and properties, noting periodic trends. This helped predict new elements.
3. Modern periodic tables are organized by atomic number not mass, reflecting Moseley's discovery of each element's unique atomic number. Periodic trends exist in properties like size, valence, and metallicity across periods and groups.Periodic classification of elements 10 CHM(5)
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The document discusses the history and development of the periodic table. It explains that Mendeleev was the first to publish a periodic table in 1869, organizing elements based on atomic mass and recognizing that elements with similar properties fell into vertical columns. However, Mendeleev's table had some anomalies, like incorrect placement of some elements. Moseley later proposed using atomic number instead of atomic mass, solving these anomalies. The modern periodic table is organized into periods and groups based on atomic number, with blocks for different orbital types. It provides information about elemental properties and reactions.Periodic-table.pptx
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The periodic table organizes the chemical elements by atomic number, electron configuration, and recurring properties. By 1869, 63 elements had been discovered, and scientists began recognizing patterns. In 1817, Johann Dobereiner proposed that elements formed triads with the middle element having average properties. In 1864, Newlands proposed the Law of Octaves stating that every eighth element has similar properties. Meyer produced one of the first periodic tables in 1864 listing 28 elements by valence. Mendeleev published the first recognizable periodic table in 1869, arranging elements by atomic mass and leaving spaces for undiscovered elements, some of which he accurately predicted properties for.More Related Content
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The document outlines the early discoveries that led to the development of the periodic table, including Dobereiner's discovery of triads of elements with similar properties, Newlands' law of octaves noting patterns every eighth element, and Mendeleev and Meyer independently publishing the first periodic tables and Mendeleev's improvements by leaving gaps for undiscovered elements. It concludes with Moseley arranging the elements by atomic number instead of atomic mass, establishing the concept of atomic number and the periodic law that the properties of elements are periodic based on their atomic number.Welcome @
Welcome @Aryaprasadsntc
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1) The document discusses the early attempts to classify elements, including Lavosiere's classification of metals and non-metals, and Dobereiner's classification of elements into triads based on similarities in atomic mass and properties.
2) It then describes John Newlands' law of octaves, where he observed that elements arranged by atomic mass had repeating properties every eighth element.
3) The main focus is on Mendeleev's periodic table, where he arranged elements by atomic mass and was able to predict properties of undiscovered elements, establishing the periodic law that properties repeat periodically with increasing atomic mass.
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The document discusses the history of organizing the elements in the periodic table. It describes the key parts of an atom and size comparison to everyday objects. Early chemists used symbols of the sun and planets to represent seven metals. By the early 1800s, over 30 elements had been identified. John Dalton developed new element symbols using capitalized first letters. Johan Berzelius suggested two letters if elements shared the first. Dmitri Mendeleev organized 63 known elements by properties into the first periodic table in 1869, grouping elements with similar properties in columns.Welcome @
Welcome @Aryaprasadsntc
油
- The document discusses the early history and development of the periodic table, from early attempts at classification by Lavoisier and Dobereiner to the establishment of periodic law by Mendeleev.
- Mendeleev arranged the elements in order of atomic mass and was able to predict properties of undiscovered elements, establishing the basis for the modern periodic table.
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The document summarizes the history and development of the periodic table. It describes early models proposed by Dobereiner, Newlands, and Meyer. It explains that Mendeleev is considered the "father" because he left gaps for undiscovered elements and his predictions were later verified. The table became more accurate when Moseley determined elements were arranged by atomic number instead of mass. Later discoveries by Seaborg expanded the table with new elements.keplers laws
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The document summarizes the key developments in the periodic table. It describes how elements are organized in the table with atomic numbers and weights. Early scientists like Dobreiner grouped elements by properties into triads. Mendeleev arranged the table by atomic mass, but Moseley correctly identified atomic number as the fundamental property through his work with X-rays. The modern periodic table arranges elements by increasing atomic number according to the Periodic Law of repeating physical and chemical properties.Periodictable2
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The document summarizes the key developments in the periodic table. It describes how elements are organized in the periodic table with their chemical symbols, atomic numbers, and atomic weights. Early scientists like Dobreiner grouped elements based on their properties. Mendeleev arranged the elements in order of increasing atomic mass. Later, Moseley determined that elements should be ordered by their increasing atomic number. The periodic law states that elements' physical and chemical properties repeat periodically when arranged by atomic number.Periodic table
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油
The document provides an overview of the periodic table including its development, characteristics, and positioning of elements. It discusses:
- There are 118 known elements placed in the periodic table based on their electronic configurations. Metals lie on the left side and non-metals on the right, separated by metalloids.
- The horizontal rows are called periods and there are 7 periods. Elements in the same period have consecutive atomic numbers. The vertical columns are called groups and elements in the same group have similar properties despite having different atomic numbers.
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Early attempts to organize elements included grouping them into triads based on similar properties or by increasing atomic mass, seeing a periodic pattern. The modern periodic table arranges elements by increasing atomic number, reflecting a periodic repetition of physical and chemical properties. Elements are classified as metals, nonmetals, or metalloids based on their general conductive properties and whether they are solids, gases, or have properties in between.Similar to Periodic table cbse 10. (20)
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油
This document summarizes key concepts from Chapter 5 on the periodic classification of elements:
1. Early scientists like Dobereiner and Newlands attempted to classify elements based on their properties but their systems did not comprehensively explain the trends.
2. Mendeleev organized the known elements into the first periodic table based on their atomic masses and properties, noting periodic trends. This helped predict new elements.
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Periodic Classification Of Elements
Introduction
The Modern Periodic Tables
Periodic Properties in the Periodic Table
Advantages of Periodic Classification
5.1 Introduction
Early Attempts in Classifying the elements
Early attempts to classify elements were based on atomic mass.
Law of Triad - Group of Three
In 1817, a German chemist Johann Dobereiner had shown that there are several groups of three chemically similar elements, which he called triads.
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The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The structure of the table shows periodic trends.
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1) Mendeleev arranged the elements in his periodic table based on increasing atomic mass, with elements of similar properties placed in columns.
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3) The periodic table is organized so that elements are classified based on atomic structure, with properties repeating periodically from row to row.periodic claassification.pdf
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1. The document discusses the history and development of the periodic table, from early classification systems to modern versions.
2. Early scientists like Dobereiner and Newlands attempted to classify elements based on recurring properties but their systems had limitations.
3. Mendeleev organized the known elements into the first recognizable periodic table based on increasing atomic mass in 1869, allowing predictions of new elements.
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1) Elements are organized in the periodic table based on their atomic number, with elements in the same group sharing similar chemical properties due to having the same number of valence electrons.
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The document summarizes key aspects of the periodic table, including:
1) Mendeleev arranged elements on cards based on properties and discovered a repeating pattern when ordered by atomic mass, leading to the creation of the periodic table.
2) The periodic table shows elements arranged in order of atomic number and classified as metals, nonmetals, and metalloids, with metals having properties like conductivity.
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- 1. PERIODIC CLASSIFICATION OF ELEMENTS 1. Doberiners Traids(1875) Elements with similar properties were arranged into of three elements called traids. He could identify only three traids from the element known. 2. Newlands law of octaves(1866). Elements were arranged in the order of increasing atomic masses such that properties of eight elements was the repetation of the properties of first element. This law worked well with lighter elements only.
- 2. 3. Mendeleevs periodic Table (1869) state that the properties of element are the periodic function of their atomic masses. Achievements Accommodated nobel gases which were discovered late. Some gaps were left to accommodate elements to be discovered later. Limitations. Could not assign a correct position to hydrogen Position of isotopes could not be explained. Wrong order of atomic masses of some elements could not be explained.
- 3. 4. Henry Moseley(1913). showed that anomalies in arrangement of elements could be removed when the elements were arrangement in order of increasing atomic number. Characteristics of modern periodic table. States that the properties of elements are periodic function of their atomic number. Consists of 18 vertical columns called group. Consists of 7 horizontal rows called periods. Atoms of different elements with same number of occupied outer shells are placed in same period. Position of an elements tell us about its chemical properties.
- 4. Trends in Modern Periodic Table Across the period. Down the group. Atomic size Valency Metallic character or electro positive radical Non metallic character or electronegative radical Decreases First increase from 1 to 4 and then decrease to 0. decrease Increases Increases Remain same. Increases Decreases