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Across 6. ionic compound composed of a cation and the anion from an acid 7. consists of symbols for the elements combined in a compound, with subscripts showing the smallest whole number ratio of the different atoms in the compound 8. assigned to the atoms composing the compound or ion 9. ions formed from a single atom

Down 1. percentage by mass of each element in a compound 2. compounds composed of two different elements 3. naming system of binary ionic compounds 4. the sum of the average atomic masses of all the atoms represent in its formula 5. polyatomic ions that contain oxygen