Atomic structure chemistry review 11th
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Atoms are made up of protons, neutrons, and electrons. The number of protons defines the element and is called the atomic number, while the total number of protons and neutrons is the mass number. Atoms are electrically neutral because they contain an equal number of protons and electrons, and isotopes are atoms of the same element that have different numbers of neutrons.
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Atomic structure chemistry review 11th
- 2. ELECTRONS, PROTONS AND NEUTRONS
- 3. ATOMIC AND MASS NUMBER
- 4. ISOTOPES OF THE ELEMENTDalton卒sAtomicTheoryAllelements are compound of submicroscopic indivisible partscalledatoms.Atoms of thesameelement are identical. Theatoms of anyoneelement are differentfromthose of anyotherelement.Atoms of differentelements can physically mix togetheror can chemically combine withoneanother in simple wholenumber ratios toformcompounds.Chemicalreactionsoccurwhenatoms are separated, joined, orrearranged. Howeveratoms of oneelement are neverchangedintoatoms of anotherelement as a result of a chemicalreaction
- 5. AtomicNumberProtons and neutronsformthesmall dense nucleus.Electronsoccupymost of theatomsvolume.Atomsdifferbythenumber of protons in theirnucleus.AtomicNumber: isthenumber of protons in thenucleus of theatom of thatelement. (thisnumberidentieftheelement)Atoms are electrically neutral # of protons = # of electrons
- 6. RelatedProblemsTheelementnitrogen (N) isatomicnumber 7.Howmanyprotons and electrons are in a nitrogenatom?Whyisanatomelectrically neutral?Whatistherelationshipbetweenthenumber of protons and theatomicnumber of anatom?
- 7. MassNumberMassNumberisthe total number of protons and neutrons in thenucleus.Anatomscomposition can be determinedfromitsatomicnumber and massnumber# of Neutrons= Mass # - Atomic #
- 8. RelatedProblemsHowmanyprotons, electrons, and neutrons are in thefollowingatoms?