Atomic Structure

                             Mass                Charge

    Proton              1                      +1

    Neutron            1                        0

    Electron       1/2000                  -1

Atomic Number - The number of protons in the nucleus

Atomic Mass - The number of protons and neutrons

Element - An element not composed of other elements

Ion - An atom or molecule with a net electric charge due to the loss or gain of one or more electrons

Molecule - A group of atoms bonded together