Don't count the d-orbital electrons as valence electrons?

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Chem_Mod
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Don't count the d-orbital electrons as valence electrons?

Postby Chem_Mod » Thu Aug 25, 2011 10:37 am

Question: Is it just a general rule that you don't count the d-orbital electrons as valence electrons for elements in the p-orbitals? For example, Xe has 8 valence e- rather than 18. Would the element Br only have 7 valence electrons, rather than 17? If this is so, what is the reason?

Chem_Mod
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Re: don't count the d-orbital electrons as valence electrons

Postby Chem_Mod » Thu Aug 25, 2011 10:37 am

Answer: Count only the electrons in the same shell, that is, the outermost shell. For Xe and Br the s and p electrons are in the same shell, but d electrons are not in the outermost shell.


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