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Question

Which is correct order of size of O−,O2−,F− and F?

A
O2>O>F>F
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B
O>O2>F>F
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C
O2>F>F>O
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D
O2+>F>O>F
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Solution

The correct option is A O2>O>F>F
As we move along a row, radius decreases and as we move down the group, radius increases.

As a particular atom gains an electron, size increases due to inter-electronic repulsions.
So, order is O>F.

Thus, O2>O>F>F.

Hence, option A is correct.

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