In which one of the following pairs is t...

In which one of the following pairs is the radius of the second species greater than that of the first?

`Na, Mg`

`Ba^(2+), Sr^(2+)`

`O^(2-), N^(3-)`

`Li^(+),Be^(2+)`

Text Solution

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The correct Answer is:

Both `O^(2-)`and `N^(3-)`are isoelectronic. For such species, size increases with increase of negative charge. Moreover the nuclear charge of `N^(3-)` is less than that of `O^(2-)`.

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In which one of the following pairs the radius of the second species is greater than that of the first?

`Na , Mg`

`O^(2-), N^(3-)`

`Li^(+), Be^(2+)`

`Ba^(2+), Sr^(2+)`

In which one of the following pairs the radius of the second species is greater than that of the first ?

`O^(-2), N^(-3)`

Na, Mg

Al, Be

`Li^(+), Be^(+2)`

In which one of the following pairs the radius of the second species is greater than that of first ?

`Ti^(4+),Mn^(7+)`

`Na, Mg`

`Cl^(-),K^(+)`

`P^(5+),P^(3+)`