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The ionic radii of K^(+), Na^(+), Al^(3+...

The ionic radii of `K^(+), Na^(+), Al^(3+) and Mg^(2+)` are in the order `

A

`Na^(+) lt K^(+) lt Mg^(2+) lt Al^(3+)`

B

`Al^(3+) lt Mg^(2+) lt Na^(+) lt K^(+)`

C

`Al^(3+) lt Mg^(2+) lt K^(+) lt Na^(+)`

D

`K^(+) lt Al^(3+) lt Mg^(2+) lt Na^(+)`

Text Solution

Verified by Experts

The correct Answer is:
B
`Al^(3+), Mg^(2+) and Na^(+)` are isoelectronic ionic species. For monoatomic ionic isoelectronic species as positive charge increases ionic size decreases. The order of size of `Na^(+) & K^(+) " is " Na^(+) lt K^(+)`
`therefore` order of ionic radii is: `Al^(3+) lt Mg^(2+) lt Na^(+) lt K^(+)`
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