Question

The electron configuration of an element is 1s22s22p4. Describe what most likely happens when two atoms of this element move toward each other.

Answer 1

Notice the last energy level: n = 2
2s2 2p4

normally an atom is stable when there are 8 total valence electrons, but in this case, the valence shell only has 6 electrons (2 from s and 4 from p). therefore, this atom will share valence electrons to complete its octet, forming a covalent bond.