The set representing the correct order of ionic radius is

Options

A. `Li^(+) gt Be^(2+) gt Na^(+) gt Mg^(2+)`
B. `Na^(+) gt Li^(+) gt Mg^(2+) gt Be^(2+)`
C. `Li^(+2) gt Na^(+) gt Mg^(2+) gt Be^(2+)`
D. `Mg^(2+) gt Be^(2+) gt Li^(+) gt Na^(+)`

Answer

B

Explanation

`Na^(+) gt Li^(+) gt Mg^(+2) gt Be^(+2)`
`116 p m gt 90 p m gt 86 gt`
Ionic size increases down the group and decreases in period from left to right.
`CaCO_(3) overset(Delta)(rarr) underset("Basic")(CaO)+underset("Acidic")(CO_(2))`
`NH_(4)NO_(3) overset(Delta)(rarr) underset("Neutral oxide")(N_(2)O+H_(2)O)`