A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion.
Electrically neutral entity consisting of more than one atom ; rigorously, a molecule, in which n > 1 must correspond to a depression on the potential energy surface that is deep enough to confine at least one vibrational state
A group of atoms in a definite arrangement held together by chemical bonds.
The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds.
Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom and a chlorine atom.