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Question

Which one of the following ions will be smallest in size?


A

Na+

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B

Mg2+

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C

F

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D

O2

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Solution

The correct option is B

Mg2+


Na+,Mg2+,O2 and F all are isoelectronic but Mg2+ has 12 protons in his nucleus, so the attraction force on the last shell is maximum and hence, it has the smallest size.


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