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Thread: stability of ions

  1. #1 stability of ions 
    New Member
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    Jan 2014
    I am confused about how to classify the stability of ions.
    For example, why Br- is more stable than Br+??
    How could i determine?

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  3. #2  
    Bullshit Intolerant PhDemon's Avatar
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    Feb 2013
    Newcastle-upon-Tyne, UK
    The simple answer is that the most stable ions are those with a filled valence shell (a filled valence shell or noble gas configuration is a very stable arrangement).

    In your example of bromine, the elctronic configurations are

    Br: [Ar] 4s2 3d10 4p5

    Br-: [Ar] 4s2 3d10 4p6 (Note the 4th shell is now full and the electronic configuration of Br- is the same as the noble gas Krypton.

    Br+: [Ar] 4s2 3d10 4p4 (This is a much less stable configuration with the valence shell only partially filled).

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