Number of Valence Electrons

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Sarah Zhari 1D
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Joined: Sat Sep 14, 2019 12:16 am

Number of Valence Electrons

Postby Sarah Zhari 1D » Fri Oct 25, 2019 11:27 am

If a question asks you to "give the number of valence electrons (including d electrons)" for manganese, how many valence electrons are there? I thought that the electron configuration of manganese is [Ar]3d5 4s2, therefore should the number of valence electrons be 2 or 7?

Shannon Asay 1C
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Joined: Fri Aug 09, 2019 12:16 am

Re: Number of Valence Electrons

Postby Shannon Asay 1C » Fri Oct 25, 2019 11:29 am

I believe it would have 7 valence electrons because you include the electrons from the d and s orbital.

SnehinRajkumar1L
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Joined: Thu Jul 11, 2019 12:15 am

Re: Number of Valence Electrons

Postby SnehinRajkumar1L » Fri Oct 25, 2019 11:32 am

The number of valence electrons is 7 for manganese. It includes the 3d orbital electrons because the difference in energy between the 3d orbital and 4s is very small, so they essentially are in the same energy level. However, transition metals can have multiple valence states, so technically 2 or 7 can be right. But, since it asks you to include d orbitals, the answer should be 7.

Sartaj Bal 1J
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Joined: Thu Jul 25, 2019 12:17 am

Re: Number of Valence Electrons

Postby Sartaj Bal 1J » Fri Oct 25, 2019 11:36 am

Transition metals can use their d electrons for bonding due to an incomplete d subshell. Therefore, a transition metal's valence electrons include the ns and (n-1)d electrons. In this case, Manganese would have 7 valence electrons.

Jenna Ortiguerra 4G
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Joined: Sat Aug 17, 2019 12:18 am

Re: Number of Valence Electrons

Postby Jenna Ortiguerra 4G » Fri Oct 25, 2019 2:36 pm

There are 7 valence electrons in manganese, with 5 valence electrons coming from the 3d orbital (since the question asks you to include d electrons) and 2 valence electrons coming from the 4s orbital.

zfinn
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Re: Number of Valence Electrons

Postby zfinn » Fri Oct 25, 2019 2:43 pm

It would have 7 valence e- (from d and s), and would more readily loose e- from the 4s shell.


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