Question

The element with a completely filled 3p subshell in its valence shell is? Argon or potassium?

Answer 1

Answer:

Argon (Ar) for example has 18 electrons and 3s and 3p orbitals of its valence shell are completely filled. This is known as stable configuration. Since it is the lowest energy configuration, the valence electrons do not take part in any chemical reaction and hence, the inertness.