Naming CompoundsNaming Compounds

RRules for Binary Compounds ules for Binary Compounds

1.1. Except for hydrogen, the element farther to the left in Except for hydrogen, the element farther to the left in the periodic table appears first: KCl, PClthe periodic table appears first: KCl, PCl33, Al, Al22SS33

2.2. If hydrogen is present, it appears last except when the If hydrogen is present, it appears last except when the other element is from column VI or VII of the periodic other element is from column VI or VII of the periodic table: LiH, NHtable: LiH, NH33, CH, CH44, H, H22S, HClS, HCl

3.3. If both elements are from the same column of the If both elements are from the same column of the periodic table, the lower one appears first: SiC, BrFperiodic table, the lower one appears first: SiC, BrF33

Guidelines for Binary Compounds Guidelines for Binary Compounds

• The element that The element that appears first retains its appears first retains its elemental nameelemental name(therefore we do not (therefore we do not change it).change it).

• The second element The second element bears a root derived bears a root derived from its elemental from its elemental name and ends with name and ends with the suffix -idethe suffix -ide

Common RootsCommon RootsBr  Bromo Br  Bromo Cl  Chlor Cl  Chlor C   Carb C   Carb F   Fluor F   Fluor H   Hydr H   Hydr

Guidelines for Binary CompoundsGuidelines for Binary Compounds

• When there is more When there is more than one atom of a than one atom of a given element in the given element in the formula, the name of formula, the name of the element usually the element usually contains a prefix that contains a prefix that specifies the number specifies the number of atoms present. of atoms present.

## PrefixPrefix CompoundCompound

11 MonoMono COCO Carbon Carbon MonoxideMonoxide

22 DiDi SiOSiO22Silicon Silicon DioxideDioxide

33 TriTri NINI33Nitrogen Nitrogen TriiodideTriiodide

44 TetraTetra CClCCl44Carbon Carbon TetrachlorideTetrachloride