Which of the following contains maximum ionic radius?

Question

Which of the following contains maximum ionic radius? (A) C4- (B) C3- (C) O2- (D)  Mg2+

Tardigrade Admin · Accepted Answer

These all are isoelectronic species. Greater the nuclear charge stronger is the attraction for same number of electrons and smaller is the ion. Thus, nuclear charge on

C^{4 +}, N^{3 -}

and

O^{2 -}

, is

6, 7

and

8

respectively but nuclear charge on

M g^{2 +}

is

12

.
Hence,

C^{4 -}

has larger ionic radius than

N^{3 -}, O^{2 -}

and

M g^{2 +}

.

Q. Which of the following contains maximum ionic radius?

$C^{4 -}$

$C^{3 -}$

$O^{2 -}$

$M g^{2 +}$

Q. Which of the following contains maximum ionic radius?

C4−

C3−

O2−

Mg2+

$C^{4 -}$

$C^{3 -}$

$O^{2 -}$

$M g^{2 +}$