2A.6 7th Edition

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Mark 1D
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Joined: Fri Sep 28, 2018 12:18 am

2A.6 7th Edition

Postby Mark 1D » Sun Oct 28, 2018 8:06 pm

Howdy! 2A.6 asks for the ground-state electron configuration of the ion P^3-. Can someone explain how I would go about solving this?

Julia Go 2L
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Joined: Sun Sep 30, 2018 12:17 am
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Re: 2A.6 7th Edition

Postby Julia Go 2L » Sun Oct 28, 2018 8:25 pm

Hello!

So, first we need to figure out the ground state electron configuration of a neutral atom of phosphorus, which is:

1s^2,2s^2,2p^6,3s^2,3p^3

We can figure this out because its in group 15, period 3. But, since we need to figure out P^3-, we have to add three electrons to the outermost shell because phosphorus gains 3 electrons. So, the electron configuration of the ion is:

1s^2,2s^2,2p^6,3s^2,3p^6


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