1.

The ionic radii of N^(3-) , O^(2-) , F^(-) " and " Na^(+) follow the order.

Answer»

`N^(3-) GT O^(2-) gt F^(-) gt Na^(+)`
`N^(3-) gt Na^(+) gt O^(2-) gt F^(-)`
`Na^(+) gt O^(2-) gt N^(3-) gt F^(-)`
`O^(2-) gt F^(-) gt Na^(+) gt N^(3-)`

ANSWER :a


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