THE PERIODIC TABLE [review]- Gr. 9.pptx
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This document summarizes key aspects of the periodic table, including its origins and organization. It describes how Dmitri Mendeleev proposed one of the first periodic tables based on increasing atomic mass and similar properties. Henry Moseley later determined that arranging elements by increasing atomic number provided better organization. The periodic law states that physical and chemical properties repeat periodically with increasing atomic number, allowing elements to be grouped according to trends in properties. Groups include metals, nonmetals, and metalloids that have properties between metals and nonmetals. Periods and groups are used to organize and understand trends across the table.
THE PERIODIC TABLE [review]- Gr. 9.pptx
- 2. THE PERIODIC TABLE (Way of Organizing the Elements)
- 3. Periodic Table Dmitri Mendeleev Proposed the a table for 70 Elements based on increasing mass and similar properties Henry Mosely Determined the atomic number and arranged the table in order of increasing atomic number
- 4. PERIODIC LAW (Periodicity) - The Periodic Law statesthat when elementsare arrangedin order of increasing atomic number, there is a periodic repetition oftheir physical and chemicalproperties. - known as a the regular patterns of properties with increasing atomic weight - Both chemical & physical properties vary in a periodic way
- 7. Periodic Trends https://ptable.com/?lang=en#Properties Access the link below for the Interactive Periodic Table https://periodictable.com/Properties/A/Ato micMass.bt.log.html
- 8. Metals - High electrical and heat conductivity - High luster - Ductile - Malleable
- 9. Nonmetals - Poor conductors of electricity and heat - Non lustrous - Some are gases at room temp (O2 & Cl2) - Others are brittle solid (S)
- 10. Metalloids - Exhibit properties that are intermediate between metals & nonmetals
- 11. Periodic Groups and Trends https://ptable.com/?lang=en#Properties Access the link below for the Interactive Periodic Table ALKALI - Group 1 - Very Reactive - Soft Solids - Readily combine with halogens - Tendency to lose 1 electron
- 12. Periodic Groups and Trends ALKALINE EARTH METALS - Group 2 - Abundant metals in earth - Not as reactive as alkali metals TRANSITION METALS - Group 3-12 - Important for living organisms (as minerals)
- 13. Periodic Groups and Trends INNER TRANSITION METALS LANTHANOIDS - Soft silvery metals - Elements 57 to 70 ACTINOIDS - Radio active elements - Elements 89 to 102
- 14. Periodic Groups and Trends NONMETALS HALOGENS - Group 17 - Salt formers NOBLE GASES - Group 18 - Relatively inert or nonreactive - Gases at room temperature