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,

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