Periods, Horizontal rows on the periodic table, Groups, Vertical columns on the periodic table, Element, A pure substance made of only one type of atom, Atomic Number, The number of protons (and electrons) in an atom, Atomic Mass/Mass Number, The mass of an atom (protons + neutrons), Isotope, An atom with a different number of neutrons, Ion, An atom that has gained or lost electrons and has a charge, Atom, The basic building blocks of matter - the smallest unit of an element that can exist, Alkali Metals, Group 1 on the periodic table, Alkaline Earth Metals, Group 2 on the periodic table, Transition Metals, Groups 3-12 on the periodic table, Halogens, Group 17 on the periodic table, Noble Gases, Group 18 on the periodic table
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Periodic Table Definitions
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Mrmontgomeryasc
Science
Chemistry
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