Question

Match list I with list II.

Li st I	Li st II
Ion	Radius (in pm)
$L{i}^{+}$	216
$N{a}^{+}$	195
$B{r}^{-}$	60
$I^{-}$	95

• A. a b d c
• B. b c a d
• C. c d b a
• D. d c b a

Answer 1

The correct option is C c d b a

Periodic variation of atomic radius:

Across a period : It decreases from left to right in a period as nuclear charge increases.

In a group : It increases from top to bottom in a group as number of shell increases.