I understand why the 1st ionization energies (1st IEs) of Group 2 elements decrease down the group.

However, why is the difference between 1st IEs of successive elements greater for Be to Ca and lower for Ca to Ba?

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  • $\begingroup$ Is there a reason you expect it to be linear? $\endgroup$ – Michael Lautman May 8 '19 at 15:11

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