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Unformatted text preview: Chemical Formulas and Compounds Formula unit- shows the number of atoms per molecule Monoatomic ion- ion is formed from a single atom Molecular shows the number of atoms Ionic shows a ratio Ions are formed from a single atom Some elements will not form ions (covalent) Some elements form ions without noble gas configuration D and p block form +2 or +3, +1 or +4 Ex. Zinc- always +2 Cadmium- always +2 Silver- always +1 O, sulfur, selenium are -2 Naming Cations (+ ions) Are written and named first by element name Add a roman numeral if it can form more than one (use stock system) Ex. Copper one chloride Copper (I) chloride, Cu+, CuCl Naming anions Root name + -ide ending Binary ionic compounds Have two different ions (two diff elements) crossing over Join for a neutral charge Number for cation becomes subscript for anion Rules for writing binary formulas: 1. Write cation first 2. Cross over charges by using absolute value of each ions charge as the others subscript2....
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