ionization energy A level chemistry AQA

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mr birling
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Explain why the second ionisation energy of calcium is lower than the second ionisation energy of potassium.



The second ionization energy of calcium is lower than the second ionization of potassium because the second electron calcium has to be removed from s orbital which has a slightly lower energy than the potassium electron which has to be removed from the d orbital. Secondly the ionization energy is lower than the potassium because d orbital is shielding the electron in the s orbital therefore even though the nuclear charge increased the atomic radi and the shielding outweigh the nuclear charge.
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would this give me full marks.
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Pigster
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(Original post by mr birling)
would this give me full marks.
I'll break it to you gently, your answer is terrible.

K doesn't use its d subshell.

And anyway, after you remove 1 e- from K, it will be 2.8.8 and the 2nd e- is therefore coming from the 3rd shell, whereas Ca still has 2.8.8.1 and its 2nd e- is coming from a much higher 4th shell.
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