Question

List the numbers of protons, neutrons, and electrons in Chlorine-18. (3 points)

Answer 1

The electronic configuration of Chlorine is 1s2 2s2 2p6 3s2 3p5.

There are three energy levels in chlorine

First energy level is n=1 has 1s2 so total 2 electrons

Second energy level is n=2, 2s2 2p6 so total 2+6= 8 electrons

Third has 3s2 3p5 electrons just 7 total... p can contain 6 electrons but only 5 are present. So the third level has lesser number of electrons than that can be filled