Protons, The subatomic particle with a positive charge, Neutrons, The subatomic particle with no charge, Electrons, The subatomic particle with a negative charge, Positive, The charge of the nucleus, Neutral, The overall charge of an atom, Nucleus, This contains the protons and neutrons, Shells, The first of these can hold 2 electrons, One, The mass of a proton and neutron, Zero (tiny), The mass of an electron, The alkali metals, Group 1 in the periodic table, Nucleons, The collective term for the particles in the nucleus, Period number, This tells us the number of electron shells an atom has, Group number, This tells us the number of valance electrons

Atomic structure review

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