Which of the following has maximum ionization energy?
A
Ba→Ba++e−
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B
Be→Be++e−
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C
Ca→Ca2++2e−
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D
Mg→Mg2++2e−
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Solution
The correct option is DMg→Mg2++2e−
I.E. ∝chargesize
Be and Ba have lost one electron each, they should have less ionization energy than Mg and Ca. But among the Mg and Ca,Mg should have more ionization energy even though both lost two electrons because Mg is smaller in size.