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AS CHEMISTRY ionisation energy multiple choice question help?

In which one of the following pairs is the first ionisation energy of element Y greater than that of element X? (Total 1 mark)

electronic configuration of: element X element Y
A 1s1 ls2
B 1s2 2s2 ls22s2 2p1
C 1s2 2s22p3 ls22s22p4
D 1s2 2s22p6 ls22s22p6 3s1

The answer is A but idek how?
Help is much appreciated :smile:
(edited 5 years ago)
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Original post by Sakura-Sama
In which one of the following pairs is the first ionisation energy of element Y greater than that of element X? (Total 1 mark)

electronic configuration of: element X element Y
A 1s1 ls2
B 1s2 2s2 ls22s2 2p1
C 1s2 2s22p3 ls22s22p4
D 1s2 2s22p6 ls22s22p6 3s1

The answer is A but idek how?
Help is much appreciated :smile:


Double the nuclear charge acting on electrons in the same shell.
Original post by Sakura-Sama
In which one of the following pairs is the first ionisation energy of element Y greater than that of element X? (Total 1 mark)

electronic configuration of: element X element Y
A 1s1 ls2
B 1s2 2s2 ls22s2 2p1
C 1s2 2s22p3 ls22s22p4
D 1s2 2s22p6 ls22s22p6 3s1

The answer is A but idek how?
Help is much appreciated :smile:

Can u share the markscheme

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