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Question

Which of the following has maximum ionization energy?


A
BaBa++e
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B
BeBe++e
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C
CaCa2++2e
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D
MgMg2++2e
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Solution

The correct option is D $$Mg\rightarrow Mg^{2+}+2e^-$$
I.E. $$\propto \cfrac{charge}{size}$$
$$Be$$ 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.
Option D is correct.

Chemistry

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