Valence, The number of bonds an atom can form, Chemical formula, Symbols and subscripts that show the types and numbers of atoms, Covalent compound, A compound in which atoms share electrons, Valence rule, A rule used to write chemical formulas, Chemical symbol, A short letter symbol for an element, Subscript, A small number written after a chemical symbol, Bond, A connection between atoms, Roman numeral, I, II, III, IV, Molecule, Two or more atoms joined together, Formula, A short way to show what a substance is made of

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