【】How many unshared pairs of electrons are in this electronic configuration? 1s² 2s² 2p⁶ 3s² 3p³

This is not a right question the right question should be like this:

How many unpaired  electrons are in this electronic configuration? 1s² 2s² 2p⁶ 3s² 3p³?

 You will get three single electrons(unpaired) in 3px¹,3py¹ and 3pz¹ if consider Hund's rule.


Explanation:

Given electron configuration,
1s² 2s² 2p⁶ 3s² 3p³
You can rewrite this:
1s² 2s² 2p⁶ 3s² 3px¹,3py¹  3pz¹

We know that 3p subshell has three degenerate orbitals which are 3px,3py and  3pz.

These three orbitals have same energy.That is why each will take one electron first,then pairing of electrons happen.So we are getting three unpaired electrons.






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