what is the electron configuration of chlorine (cl)?\no 1s²2s²2p⁶3s²3p³\no 1s²2s²2p⁶3s²3p⁵\no…

Explanation:

Step1: Recall chlorine's atomic number

Chlorine has atomic number 17, so 17 electrons.

Step2: Fill electron - subshells

Fill sub - shells in order of increasing energy: 1s can hold 2 electrons, 2s can hold 2 electrons, 2p can hold 6 electrons, 3s can hold 2 electrons, and remaining 5 electrons go in 3p. So the electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$.

Answer:

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$ (the second option)