atomic-size-handout - Atomic size A tomic size Which a) Ne...

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Unformatted text preview: Atomic size A tomic size Which a) Ne or Ar Is b) B or C Bigger c) P or Ge Patterns in Atomic Size Patterns in Atomic Size Electron configuration for Br: [Ar]4s 2 3d 10 4p 5 , valence electron configuration for Br: 4s 2 4p 5 . We often only focus on valence electrons: they are involved in reactions and determine size Two factors affect size: n and the balance between attractions & repulsions in the atom. Atomic size refers to the distance that the furthest (valence) electrons are from nucleus It can affect the properties of atoms & elements Decreasing Atomic Size Across a Period Decreasing Atomic Size Across a Period As the attraction between the +ve nucleus and the -ve valence electrons , the atomic size . From left to right, size decreases because there is an increase in nuclear charge and Effective Nuclear Charge (# protons # core electrons) Each valence electron is pulled by the full ENC Li (ENC = 1) + + + Be (ENC = 2) + + + + B (ENC = 3) +...
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This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

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