MetE227-c2 - CHAPTER 2 CHAPTER Atomic Structure and...

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CHAPTER CHAPTER 2: 2: Atom Atom ic ic Structure and Structure and Interatomic Bonding Interatomic Bonding
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Nucleus: Z = # protons orbital electrons: n = principal quantum number n=3 2 1 = 1 for hydrogen to 94 for plutonium N = # neutrons Atomic mass A Z + N BOHR ATOM
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Bohr Atomic Model vs. Wave-Mechanical Model
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• have discrete energy states • tend to occupy lowest available energy state. Increasing energy n=1 n=2 n=3 n=4 1s 2s 3s 2p 3p 4s 4p 3d Electrons. .. ELECTRON ENERGY STATES
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Relative Energies of the Electrons for Various Shells and Subshells
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• have complete s and p subshells • tend to be unreactive . Stable electron configurations. .. Z Element Configuration 2 He 1s 2 10 Ne 1s 2 2s 2 2p 6 18 Ar 1s 2 2s 2 2p 6 3s 2 3p 6 36 Kr 1s 2 2s 2 2p 6 2 6 3d 10 4s 2 4p 6 STABLE ELECTRON CONFIGURATIONS
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• Columns: Similar Valence Structure Electropositive elements: Readily give up electrons to become + ions. Electronegative elements: Readily acquire electrons to become - ions. He Ne Ar Kr Xe Rn inert gases accept 1e accept 2e give up 1e give up 2e give up 3e F Li Be Metal Nonmetal Intermediate H Na Cl Br I At O S Mg Ca Sr Ba Ra K Rb Cs Fr Sc Y Se Te Po THE PERIODIC TABLE
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MetE227-c2 - CHAPTER 2 CHAPTER Atomic Structure and...

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