The element with the ground state electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁵ is
A)Ar.
B)Cl.
C)S.
D)Br.

Question

Quizplus · Accepted Answer

The electron configuration corresponds to the electron configuration of chlorine (Cl). The 1s² and 2s² 2p⁶ represent the filled inner shells, while the 3s² 3p⁵ represent the valence electrons of chlorine. None of the other answer choices would have this electron configuration.

The Element with the Ground State Electron Configuration of 1s²