Valence in d-block

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Karina Rodriguez 2H
Posts: 50
Joined: Wed Sep 30, 2020 9:34 pm

Valence in d-block

Postby Karina Rodriguez 2H » Tue Nov 24, 2020 10:22 pm

How would you find the number of valence electrons in an element in the d-block? Additionally, will this be asked of us?

Sabina House 2A
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Joined: Wed Sep 30, 2020 9:35 pm
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Re: Valence in d-block

Postby Sabina House 2A » Tue Nov 24, 2020 10:26 pm

To find the valence electrons in the d-block, you should include the s-block electrons from the period of that element as well as any d-block electrons in that period. You can do this by counting over from the left side of the periodic table towards the element. For example, Mn would have 7 valence electrons. I think I remember reading somewhere that questions regarding the number of valence electrons of the d-block elements will try to be avoided on exams but I am not completely sure about that.

Lily Kiamanesh 2G
Posts: 87
Joined: Wed Sep 30, 2020 10:09 pm

Re: Valence in d-block

Postby Lily Kiamanesh 2G » Tue Nov 24, 2020 10:40 pm

Hi! I believe that valence electrons are all the electrons that are added to the prior noble gas notation if that is a helpful way to think about it. For example, Iron, which has 26 total electrons, has a noble gas notation of [Ar]3d64s2. This would make Fe have 8 electrons in its valence shell.

Edwin Liang 1I
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Joined: Wed Sep 30, 2020 9:34 pm

Re: Valence in d-block

Postby Edwin Liang 1I » Thu Nov 26, 2020 1:53 am

For most d-block elements in period 4, you would add have [Ar] 4s2 and some number of electrons in 3d orbital. As you go along the d block, add one electron to 3d. There are exceptions, such as Cr and Cu in which the 4s orbital is missing one electron. Cr is [Ar]4s1 3d5 and Cu is [Ar]4s1 3d10

Samudrala_Vaishnavi 3A
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Joined: Wed Sep 30, 2020 9:34 pm

Re: Valence in d-block

Postby Samudrala_Vaishnavi 3A » Mon Dec 07, 2020 8:16 am

So when you are taking into account the d block, you would count its valence electrons just like you would do for the s and p block, just make sure that for the 4th period, you count the d-block as it overlaps with the s and p blocks at that rate. Now, the only thing you would do differently, in terms of the electron configuration, subtract the n value or the period value by one (also you would subtract by 2 for the f orbital). Then, make sure that you place it below the other shell configuration values since it has a lower potential energy (lower shell value since you subtracted).


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