Chem Lec 20100922

Chem Lec 20100922 - 8.11 Electron Configurations 8.11 Noble...

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8.11 Electron Configurations 8.11 Electron Configurations Noble Gas Electron Configuration 1s 2s 2p Ne (Z=10) Valence electrons (orbitals with highest n) Inner shell e - Noble gases are unusually stable because they have completely filled orbitals Filled octet: 8e - They don’t want to gain or lose e - 8.11 Electron Configurations Noble Gas Electron Configuration 1s 2s 2p Ne (Z=10) To simplify the notation, chemists use the following notation to represent filled inner shells: [Noble Gas Chemical Symbol] [Ne] stands for 1s 2 2s 2 2p 6 8.12 e 8.12 e - Configurations & The Periodic Table 8.12 e - Configurations & Periodic Table 8.12 e - Configurations & The Periodic Table Important Point The filling order table provides a general guide…there are exceptions…we will discuss them 8.12 e 8.12 e - Configurations & The Periodic Table Groups run down…Periods run across Table Group 1 8.12 e - Configurations & The Periodic Table Groups run down…Periods run across Table Period 4 Group 1
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8.12 e 8.12 e - Configurations & The Periodic Table Configurations & The Periodic Table Elements in same group have same electron configurations 8.12 e 8.12 e - Configurations & The Periodic Table Configurations & The Periodic Table Group 1 ns 1 Group 17 ns 2 np 5 Group 18 Noble gases ns 2 np 6 Except helium 1 valence e - 7 valence e - “Octet” 8.12 e 8.12 e - Configurations & The Periodic Table Group 1 ns 1 Group 17 ns 2 np 5 Group 18 Noble gases ns 2 np 6 Except helium 1 valence e - 7 valence e - “Octet” Note: Quantum Number n corresponds to the Period Number 8.12 e - Configurations & The Periodic Table Group 1 ns 1 Group 18 ns 2 np 6 Group 17 ns 2 np 5 * * Except He 8.12 e 8.12 e - Configurations & The Periodic Table Refer to “blocks” in the periodic table according to which orbitals are being filled s block, p block, d block, f block s block & p block are Main Group Elements d block are Transition Metals f block are Lanthanides & Actinides (Rare- earth elements) 8.12 e - Configurations & The Periodic Table s block Main Group Elements p block Filling ns orbitals Filling np orbitals
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8.12 e 8.12 e - Configurations & The Periodic Table Configurations & The Periodic Table s block d block Transition metals p block Filling (n-1)d orbitals 8.12 e 8.12 e - Configurations & The Periodic Table Configurations & The Periodic Table s block d block Transition metals f block p block Filling (n-2)f orbitals 8.12 e 8.12 e - Configurations & The Periodic Table f orbitals start filling after lanthanum (Z=57) & after actinium (Z=89) La [Xe]5d 1 6s 2 Ac [Rn]6d 1 7s 2 Then the f orbitals start filling…# = no. of e - [Xe]4f # 5d 1 6s 2 [Rn]5f # 6d 1 7s 2 Note La & Ac are d block f block When f orbitals are filled…filling of the d resumes 8.12 e - Configurations & The Periodic Table Note there are exceptions to the filling table La [Xe]5d 1 6s 2 Ac [Rn]6d 1 7s 2 [Xe]4f # 5d 1 6s 2 [Rn]5f # 6d 1 7s 2 f block One electron goes into the 6d orbital before filling the 5f One electron goes into the 5d orbital before filling the 4f You are not responsible for knowing this 8.12 e 8.12 e - Configurations & The Periodic Table f orbitals start filling after lanthanum (Z=57) & after actinium (Z=89) La [Xe]5d 1 6s 2 Ac [Rn]6d 1 7s 2
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Chem Lec 20100922 - 8.11 Electron Configurations 8.11 Noble...

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