Valence Electrons - the outermost shell of an atom holding electrons, Ionic compounds _______ electrons - transfer, Covalent compounds ______ electrons - share, These come BEFORE a word - prefixes, Polar covalent compounds __________ - share electrons unequally, Nonpolar covalent compounds _________ - share electrons equally, Covalent Compounds - Made up of nonmetals only, Ionic Compounds - Made up of a metal and nonmetal, Diatomic molecules - Elements that always exist as a pair, Molecular formula - includes symbols and count of how many elements are present, Molecular name - name of compound including prefixes, Octet Rule - Atoms need a full shell of 8 valence electrons, mono- - 1, di- - 2, tri- - 3, tetra- - 4, penta- - 5, hexa- - 6, hepta- - 7, octa- - 8, nona- - 9, deca- - 10,

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