Which of the following has largest ionic radius?

Question

Which of the following has largest ionic radius? (A) Cs + (B) Li + (C) Na + (D) K +

Tardigrade Admin · Accepted Answer

Atomic and ionic radii increase from top to bottom in a group due to the inclusion of another shell at every step. Hence, Cs +ion will be the largest among given IA group ions, i.e. Na +, Li +and K +.

Q. Which of the following has largest ionic radius?

$C s^{+}$

$L i^{+}$

$N a^{+}$

$K^{+}$

Atomic and ionic radii increase from top to bottom in a group due to the inclusion of another shell at every step. Hence, $C s^{+}$ ion will be the largest among given IA group ions,
i.e. $N a^{+}, L i^{+}$ and $K^{+}$ .