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Second IP of La is most likely to second IP of which element:

(1) Be
(2) Ba
(3) Ca
(4) Zn

The given answer is calcium. I don't understand if the 6s electron or the 5d electron leaves on ionization. Any help is appreciated.

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closed as off-topic by Tyberius, user55119, Mathew Mahindaratne, Mithoron, Jon Custer Jul 16 at 1:08

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During ionization only the electrons in last shell leaves.So its 6s

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