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Ionisation Energy

For question 15: https://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Topic-Qs/AQA/Physical-I/1.1-Atomic-Structure/Set-F/Atomic%20Structure%20(Multiple%20Choice)%20QP.pdf

Why is the answer A? Wouldn't the repulsion in the 1s subshell mean that the ionisation energy of Y is lower than X as opposed to higher?
(edited 3 years ago)
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Pigster
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Original post by Pyruvic Acid
For question 15: https://pmt.physicsandmathstutor.com/download/Chemistry/A-level/Topic-Qs/AQA/Physical-I/1.1-Atomic-Structure/Set-F/Atomic%20Structure%20(Multiple%20Choice)%20MS.pdf

Why is the answer A? Wouldn't the repulsion in the 1s subshell mean that the ionisation energy of Y is lower than X as opposed to higher?


According to the document you linked, the answer to 15 is A, since it says A.
Original post by Pigster
According to the document you linked, the answer to 15 is A, since it says A.

Ah, I see. Have edited the original post now :biggrin:
Reply 3
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Pigster
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Original post by Pyruvic Acid
Ah, I see. Have edited the original post now :biggrin:


Electrons sharing an s orbital don't repel each other as much as they do in p orbitals, but I'd bet your spec won't expect you to know that. Yes there is repulsion, but the extra p+ is more important.

I'll bet your spec does expect you to know that going from N to O there is a drop in IE due to the repulsion between e- having to share a p orbital.

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