Question

# Which of the following has maximum ionization energy?

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

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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