Atom - made from protons, neutrons, and electrons. Neutral charge.
Ion - an atom with a positive or negative charge after gaining or losing an electron. Positively charged ions are known as cations. Negatively charged ions are known as anions.
Molecule - more than one atom bonded together
Compound - Two or more different elements chemically bonded together
Empirical Formula - the simplest ratio of elements bonded together in a compound. To find this divide the mass given by the Mr and then divide the answer by the smallest answer.
Molecular Formula - the number of each element actually bonded together to form a molecule
Ionic Equations - equation written out with all the ions separate.…