D block valence electrons

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D block valence electrons

Postby juliasloan_4g » Mon Oct 29, 2018 10:35 pm

How do you count valence electrons when an element is in the d block? Do you only count the s block or the d block as well up until that element? If you don't include the d block why is this?

Mindy Kim 4C
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Re: D block valence electrons

Postby Mindy Kim 4C » Mon Oct 29, 2018 10:46 pm

Valence electrons are those after the preceding noble gas. Therefore, if you write the electron configuration for the element, whichever electrons come after the preceding noble gas are all valence electrons. For example, for manganese, the electron configuration is [Ar]3d54s2. Therefore, manganese has 7 valence electrons.

Gary Qiao 1D
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Joined: Fri Sep 28, 2018 12:26 am

Re: D block valence electrons

Postby Gary Qiao 1D » Mon Oct 29, 2018 10:51 pm

You only count the s and p block electrons. You do not count the d block electrons because the d block would not be part of the outermost shell. For instance, with gallium, [3d104s24p1], the s and p are in the same larger shell than d (4 compared to 3). For transition metals, groups 3-11, they are allowed to use the d orbital as part of their valence electron, so manganese can have 2 or 7 valence electrons.

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