atomic-size - Atomic Atomic size Patterns in Atomic Size...

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Atomic size Atomic size
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a) Ne or Ar b) B or C 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 Larger Larger Atomic size refers to the distance that the furthest (valence) electrons are from nucleus Which Is Bigger ?
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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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Sizes of ions Sizes of ions Ions are atoms that have either gained or lost electrons (so that the # of electrons is not equal to the # of protons) The size of an atom can change dramatically if it becomes an ion (reference: pg. 214) E.g. when sodium loses its outer electron to become Na + it becomes much smaller. Why?
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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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atomic-size - Atomic Atomic size Patterns in Atomic Size...

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