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Co3+

Discussion in 'MCAT Study Question Q&A' started by amar21, May 26, 2008.

  1. amar21

    amar21 professional crammer
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    the configuration of Co is [Ar] 4s2 3d7

    why when Co forms an ion at Co3+ does it become [Ar]3d6...

    I dont see why the electronics are removed from the s-orbital before the d here... can anyone explain this to me real quick?
     
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  3. rocuronium

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    When transition metals form ions, they lose electrons from the subshell with the highest principle quantum number first. That's why the 2 4s electrons are not present.
     
  4. amar21

    amar21 professional crammer
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    i'll assume thats a general rule then

    thank you.
     
  5. dshnay

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    Interesting, I would have assumed it to be 4s1 3d5, since this way the d shell would be half full thus more stable.
     
  6. amar21

    amar21 professional crammer
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    yeah

    thats what i thought as well... half full being more stable but apparenylt this is a general rule for transition metals
     

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