Question

Which element contains exactly three types of sublevels, all completely full, and what other element contains 6 electrons in it's fourth energy level?

Answer 1

The element that contains exactly three types of sublevels, all completely full, is Argon (Ar), with the electron configuration of 1s2 2s2 2p6 3s2 3p6.

Step-by-step explanation:

The other element that contains 6 electrons in its fourth energy level is Chromium (Cr), with the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s1 3d5.

Answer 2

the elements contains 6 electrons in its fourth energy level is silicon