CHEM-UA 125 Chapter Notes - Chapter 2.7: Roman Numerals, Ionic Compound, Transition Metal

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In a chemical formula, element symbols and often, numerical subscripts show the type and number of each atom in the smallest unit of the substance. Monatomic ions of elements in the same main group have the same ionic charge. Na is in group 1a and forms na+ For anions, ion charge equals a-group # - 8. S is in group 6a (6-8=2) so forms s2- The formulas of an ionic compound represents the formula unit, which is the relative numbers of cations and anions in the compound. The subscript refers to the element symbol preceding it. The subscript 1 is understood from the presence of the element symbol alone. The charge of one ion becomes the subscript of the other: compounds of metals that form more than one ion. Transition elements can form more than one ion. Names of compounds containing transition metals include a roman numeral in parentheses after the metal ions name to indicate its ionic charge.

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