14 - 7.4 Periodicity of Electron Configurations ! Alkali...

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7.4 Periodicity of Electron Configurations ! Alkali metals: Li 1 s 2 2 s 1 Na 1 s 2 2 s 2 2 p 6 3 s 1 K 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 1 Rb 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 6 5 s 1 ! Alkaline earth metals: Be 1 s 2 2 s 2 Mg 1 s 2 2 s 2 2 p 6 3 s 2 Ca 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 Sr 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 6 5 s 2 ! Halogens: F 1 s 2 2 s 2 2 p 5 Cl 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 Br 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 5 ! Noble gases: Ne 1 s 2 2 s 2 2 p 6 Ar 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 Kr 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 10 4 p 6 ! The periodic table can be subdivided into different blocks. These blocks correspond to the highest-energy electrons-those that are in the last-filled sublevel when we write electron configurations. Periodicity of Electron Configurations " The number of columns in the s , p , d , and f blocks is the same as the number of electrons allowed in each sublevel. ns 1 ns 2 np 1 np 2 np 3 np 4 np 5 np 6 nd 1 nd 2 nd 3 nd 4 nd 5 nd 6 nd 7 nd 8 nd 9 nd 10 nf 1 nf 2 nf 3 nf 4 nf 5 nf 6 nf 7 nf 8 nf 9 nf 10 nf 11 nf 12 nf 13 nf 14
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! The principal energy level number, the number that comes before the sublevel letter designation, is the same as the period number for the s and p sublevels. " For the d sublevels, the principal energy level number is one less than the period number. C:
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This note was uploaded on 04/03/2011 for the course CHEM 111 taught by Professor Cao during the Fall '07 term at Purdue University-West Lafayette.

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14 - 7.4 Periodicity of Electron Configurations ! Alkali...

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