Which of the following configurations represents the `s-block` element?

Options

A. `[Ar]3d^(10)Rs^(1)`
B. `[Ne]^(3s^(2)3p^(1)`
C. `[He]2s^(2)2p^(6)3s^(1)`
D. None of these

Answer

C

Explanation

The block of an element depends on the type of shell which receies the last electron.As last enters in s-subshell of ourtermost shell according Aufbau rule, the element of option © beongs s-block.