A ___________ is formed when two or more atoms bond chemically.
molecule
A molecule is the smallest particle of an element or compound that can exist independently. It is formed when two or more atoms are bonded chemically. For example, the element hydrogen cannot exists independently as a single atom therefore two hydrogen atoms bind chemically to form H2 molecule. A compound is formed when different elements are bonded chemically. For example, H2O is a compound. Element is the simplest form of substance. A radical can be an atom, molecule, or ion that has unpaired valence electrons in its shell.