Answer:
Ion - an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Polar molecule - A polar molecule is a molecule containing polar bonds where the sum of all the bond's dipole moments is not zero.
Subscript - A subscript is a character, usually a letter or number, that's printed slightly below and to the side of another character.
Coefficient - a coefficient is a constant term related to the properties of a product.