Which one of the following ions has the highest value of ionic radius?

Question

Which one of the following ions has the highest value of ionic radius? (A) B3 + (B) O2 - (C) Li+ (D) F-

Tardigrade Admin · Accepted Answer

All the ions belongs to same period thus for them cations will be smaller than anions as during cation formation outer orbit is lost and effective nuclear charge increases so size decreases.

O^{2 -}

and

F^{-}

are isoelectronic and

r_{n} \propto \frac{1}{Z}

So ionic radius of

O^{2 -} (Z = 8) > F^{-} (Z = 9) > L i^{+} (Z = 3) > B^{3 +} (Z = 5)

Q. Which one of the following ions has the highest value of ionic radius?

$B^{3 +}$

$O^{2 -}$

$L i^{+}$

$F^{-}$

Q. Which one of the following ions has the highest value of ionic radius?

B3+

O2−

Li+

F−

All the ions belongs to same period thus for them cations will be smaller than anions as during cation formation outer orbit is lost and effective nuclear charge increases so size decreases. O2− and F− are isoelectronic and rn​∝Z1​ So ionic radius of O2−(Z=8)>F−(Z=9)>Li+(Z=3)>B3+(Z=5)

$B^{3 +}$

$O^{2 -}$

$L i^{+}$

$F^{-}$