Question

what is a molecule?
all of these
a compound formed when atoms share electrons to achieve a full valence shell
a compound formed by covalent bonds
a compound between nonmetals

Explanation:

A molecule is formed when atoms share electrons (covalent bonding) to complete their valence shells. Covalent bonds are typically between non - metals. So, all the given options are correct descriptions related to molecules.

Answer:

ALL of these