1. Naming Compounds

2. Rules for Binary Compounds 1.Except for hydrogen, the element farther to the left in the periodic table appears first: KCl, PCl 3, Al 2 S 3 2.If hydrogen is present, it appears last except when the other element is from column VI or VII of the periodic table: LiH, NH 3, CH 4, H 2 S, HCl 3.If both elements are from the same column of the periodic table, the lower one appears first: SiC, BrF 3

3. Guidelines for Binary Compounds The element that appears first retains its elemental name (therefore we do not change it).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 -ideThe second element bears a root derived from its elemental name and ends with the suffix -ide Common Roots Br Bromo­ Cl Chlor­ C Carb­ F Fluor­ H Hydr

4. 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.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. #PrefixCompound 1MonoCO Carbon Monoxide 2Di SiO 2 Silicon Dioxide 3Tri NI 3 Nitrogen Triiodide 4Tetra CCl 4 Carbon Tetrachloride