Which has a higher ionization energy magnesium or calcium?

magnesium has a higher ionization energy because its radius is smaller. calcium has a higher ionization energy because it outermost sub-energy level is full. they have the same ionization energy because they have the same number of valence electrons.

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Explanation:

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter