# of Electrons for Sb

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# of Electrons for Sb

Postby Sophia_Kiessling_2L » Sun Nov 04, 2018 12:37 pm

Question 2A.1 in the 7th edition textbook says that Sb has 5 valence electrons when including the d-block but shouldn't it be 15? Why is it 5 e-?

Alexandra Albers 1D
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Re: # of Electrons for Sb

Postby Alexandra Albers 1D » Sun Nov 04, 2018 12:56 pm

Sb has only 5 valence electrons because its structure is [Kr] 5s^2 2p^3. You are counting the d-orbital which comes before it, which is the 4d row. The 4d row is full by this point, so it is lower energy than the 5s and 5p rows. Therefore, when you are removing electrons the 5p and then the 5s orbitals would have their electrons removed first.

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