Mass Number, number of protons + number of neutrons, Atomic number, Number of protons, Symbol, a one or two letter notation that is used for denoting the chemical element, Isotope, atoms that have the same atomic number and a different mass number, Group, column of elements, Period, row of elements, Proton, positive sub atomic particle found in the nucleus, electron, negative sub atomic particle occupying orbitals surrounding a nucleus, Neutron , Neutral subatomic particle found in the nucleus, 1 amu, mass of a neutron or proton.

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