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Stuck with easy chemistry multiple choice question ( a level )

Hi so I can’t seem to understand why the answer is C so any help would be greatly appreciated. My thinking was that it would be A or B as I thought that as you move to the right the nuclear charge increases and therefor ionisation energy but that is obviously wrong . I’ll attach the question :smile:
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Here is the question
Original post by 15katiesmith
Hi so I can’t seem to understand why the answer is C so any help would be greatly appreciated. My thinking was that it would be A or B as I thought that as you move to the right the nuclear charge increases and therefor ionisation energy but that is obviously wrong . I’ll attach the question :smile:


This question is testing your knowledge of the aufbau principle.
You have to consider:
1. The nuclear charge
2. The orbital from which the electron will be removed.
1st_ie.png

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