Valence electron

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Chase Yonamine 1J
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Joined: Fri Sep 28, 2018 12:17 am

Valence electron

Postby Chase Yonamine 1J » Thu Nov 01, 2018 11:32 pm

How do you determine the number of valence electrons of elements in d block elements?

Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

Re: Valence electron

Postby amogha_koka3I » Thu Nov 01, 2018 11:38 pm

The transition metals don't have a traditional method to identify valence electrons like the other groups, but I don't think we have gone over in class how to determine how many valence electrons each transition metal has.

Rachana Jayaraman 1H
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Joined: Fri Sep 28, 2018 12:26 am

Re: Valence electron

Postby Rachana Jayaraman 1H » Thu Nov 01, 2018 11:41 pm

The number of valence electrons in the d-block is usually the group number plus 2 (for the 2 electrons in the preceding s orbital) in the ground state. For example, scandium's configuration is [Ar]3d^14s^2, so it has 3 valence electrons. This may only work for the first 2 rows though because further down there are elements in the f-block.

Brian Chhoy 4I
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Joined: Fri Sep 28, 2018 12:16 am

Re: Valence electron

Postby Brian Chhoy 4I » Fri Nov 02, 2018 12:07 am

The valence electrons for the elements in the d block are always the amount of electron in the outermost shell. For example, for Mn: [Ar] 4s^2 3d^5. There are 2 valence electrons because the 4th energy level is the outer most orbital.

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Re: Valence electron

Postby taywebb » Fri Nov 02, 2018 2:29 pm

I'm still slightly confused. The solutions manual says that Mn has 7 valence electrons, but it is in the 7th group, so you're saying that it would have 9?

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