Question

Which of the following element has the electron configuration of $1s^2{s}^{2}2p^{6}3s^{2}3p^4$?

• A. Ar
• B. O
• C. S
• D. Ti
• E. U

Answer 1

The correct option is C S

S (Z=16) has the electron configuration $1s^2{s}^{2}2p^{6}3s^{2}3p^4$.
The electronic configuration of Ar (Z=18) is $1s^2{s}^{2}2p^{6}3s^{2}3p^6$.
The electronic configuration of O (Z=8) is $1s^2{s}^{2}2p^4$.
The electronic configuration of Ti (Z=22) is $1s^2{s}^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^2$.
The electronic configuration of U (Z=92) is $\left[Rn\right]5f^{3}6d^{1}7s^2$.