3-3.6 - Electrons core tightly bound inner e-s filled lower...

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1 Electrons core valence tightly bound, inner e - s filled lower E levels unaffected by chemical reactions outermost e - s involved in chemical bonding Section 3.1 + 1 + + + + 2 3 4 5 Bohr Model Section 3.2 Which electron(s) have the lowest energy and are core electrons? Which electron(s) do the work and are valence electrons? 1 2 3 4 5 6 2 3 4 5 6 7 7 3 d 4 4 f 5 Period s Period p (Period-1) d (Period-2) f Section 1.9 Main Group Elements: s and p blocks Outermost electrons and all electrons in partially filled sublevels. Valence electrons definition: For main group elements: per s & p e - s ns 1 3s 1 Na ns 2 Ca 4s 2 ns 2 n p 1 Al 3s 2 3p 1 ns 2 n p 2 Sn 5s 2 5p 2 1A 2A 3A 4A 5A 6A 7A Valence configurations for select atoms Section 3.1 ns 2 n p 3 ns 2 n p 4 ns 2 n p 5 I Se N 2s 2 2p 3 5s 2 5p 5 4s 2 4p 4 # of valence e’s = main group column number 1 2 3 4 5 6 2 3 4 5 6 7 7 3 4 4 5 Period Period (Period-1) (Period-2) Section 1.9 Transition Metals: d block Outermost electrons and all electrons in filled sublevels. Valence electrons For transition metals: s 2 ( per - 1 ) d x Ni Element e - config. using [NG] Valence e - config. [Ar] 4s 2 3d 8 4s 2 3d 8 [Ar] 4s 2 3d 10 Zn 4s 2 Section 3.1 [Kr] 5s 2 4d 3 Nb 5s 2 4d 3
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2 Valence electrons C Cd Outermost s electrons and all electrons in partially filled sublevels. W
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This note was uploaded on 03/30/2010 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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3-3.6 - Electrons core tightly bound inner e-s filled lower...

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