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Question

Which of the following has the smallest size?


A

Na+

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B

Mg2+

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C

Cl

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D

F

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Solution

The correct option is B

Mg2+


As the nuclear charge per e is maximum in Mg2+, it has smallest size among Na+, Mg2+, Cl and F.

To make it more elaborate:

Na+ and Mg2+ have only 2 outer shells so they are smaller.

Now between Mg2+ and Na+, Mg2+ has a higher number of protons, so higher effective nuclear charge.


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