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Naming Compounds. R ules for Binary Compounds. Except for hydrogen, the element farther to the left in the periodic table appears first: KCl, PCl 3 , Al 2 S 3
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Rules for Binary Compounds • Except for hydrogen, the element farther to the left in the periodic table appears first: KCl, PCl3, Al2S3 • If hydrogen is present, it appears last except when the other element is from column VI or VII of the periodic table: LiH, NH3, CH4, H2S, HCl • If both elements are from the same column of the periodic table, the lower one appears first: SiC, BrF3
The element that appears first retains its elemental name(therefore we do not change it). The second element bears a root derived from its elemental name and ends with the suffix -ide Common RootsBr BromoCl ChlorC CarbF FluorH Hydr Guidelines for Binary Compounds
When there is more than one atom of a given element in the formula, the name of the element usually contains a prefix that specifies the number of atoms present. Guidelines for Binary Compounds