1.

Which of the following arrangements represents the increasing order (smallest of largest) of ionic radii of the given species O^(2-),S^(2-),N^(3-),P^(3-)?

Answer»

`O^(2-) LT N^(3-) lt S^(2-), P^(3-)`
`O^(2-) lt P^(3-) lt N^(3-), s^(2-)`
`N^(3) lt O^(2-) lt P^(3-) lt S^(2-)`
`N^(3-) ltS^(2-)ltO^(2-)ltP^(3-)`

SOLUTION :For isoelectronic species ionic radii decreases as the charge on ION decreases. Further on MOVING down in a group ionic radii increases. Hence the correct ORDER is
`O^(2-)ltN^(3-)ltS^(2-)ltP^(3-)`


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