Question

The incorrect order of atomic radius for the following elements is ______________.

• A. Kr>Ar>Ne>He
• B. B<Al<Ga<In
• C. K>Na>Li>H
• D. All of the orders are correct.

Answer 1

The correct option is D

All of the orders are correct.

Atomic radius increases down the group and across the period from the right. With this rule, you can see that Rb > K, not other way round.