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Which one of the following is the smalle...

Which one of the following is the smallest in size?

A

`Na^(+)`

B

`Mg^(2+)`

C

`F^(-)`

D

`O_(2)^(-)`

Text Solution

Verified by Experts

The correct Answer is:
B
`Na^(+), Mg^(2+) , O^(2-) and F^(-)` all are isoelectronic but `Mg^(2+)` have 12 protons in his nucleus, so the attraction force on last shell is maximum and hence, it have smallest size
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