1Atoms and the Periodic TableChapter 12Pages 285-305Review Questions 1, 3-12, 21, 25-27Atomic Structure• Protons• Neutrons• ElectronsCloud Model of Atom Atomic model analogyhttp://www.sportslighting.com/feature/ls.htmlAnalogy of atom--conthttp://www.joesentell.com/panther/panther.htmhttp://web.ics.purdue.edu/~drhodes/hort410/vgsd13.htmhttp://www.skynet.ie/~ceason/cormac/stuff/housefly_anim.gifPeriodic Table2Atomic symbolOnly first letter is capitalCO is not cobalt (Co)Atomic Structure--Protons Electrical charge +1 Equal number of negative electrons Balance to zero charge Atomic number is # of protons Mass = 1 atomic mass unit (u)Atomic Structure--Neutrons Electrical charge 0 Mass = 1 atomic unit Atomic Structure--Nucleus• Protons• NeutronsMake up the NUCLEUSNEW KLEE USNucleons—have massNEW KLEE ONS• Electrons—minimal massAtomic Structure-- Electrons Electrical charge -1 Mass = almost nothing(1/1837 of a proton)Isotope notationStable Isotope of SodiumAtomic number is protons, number of nucleons is isotope3Periodic Table coding• Metals, nonmetals and metalloidsPeriods and GroupsPeriods Groups (families)Inner transition metalsPeriodic Table• Metals, nonmetals and metalloids4Analogy of atom--conthttp://www.joesentell.com/panther/panther.htmhttp://web.ics.purdue.edu/~drhodes/hort410/vgsd13.htmhttp://www.skynet.ie/~ceason/cormac/stuff/housefly_anim.gifShell Model of AtomsElectrons shells in periodic table• First three periodsAtomic Structure-- Protons Atomic Number Controls properties of elements Constant number for all atoms of the same elementAtomic Structure--Neutrons• Atoms may have different numbers of neutrons• Different atomic masses of atoms of the same element• ISOTOPES of the same elementAtomic Structure--Electrons• Positioned in energy shells•First_level 2•Second_level 8•Third_level
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