Naming Binary Molecular Compounds 2 elements covalent bond 3 Rules to Name 1. Name the first element using the entire name 2. Second element in the formula- use the root word and end in ide ex: Oxygen
Oxide Sulfide Sulfur Hydride Hydrogen 3. Add a prefix to both words to indicate the number of atoms 1. mono6. hexa2. di7. hepta3. tri8. octa4. tetra9. nona5. penta10. deca- 2 Exceptions to the rule
1. When the formula contains one atom of the first element, omit mono Carbon Dioxide ex: CO2 Not: Monocarbon Dioxide 2 Exceptions to the rule 2. Drop the final letter in the prefix if the element begins with a vowel - For prefixes 1 & 4-9
ex: CO Carbon monoxide Not: Carbon monooxide Example 1 S4N2 tetra sulfur di nitride
nitrogen tetrasulfu dinitride r Example 2 SO3 tri Only one atom of sulfur- so no prefix needed
oxyge n sulfu trioxide r Example 3 P4S5 tetra penta
sulfur tetraphosphorus pent sulfide a Example 4 CO mono
Only one atom of carbon oxyge n carbo monoxide n - so no prefix needed NOT
monooxide Example 5 NH3 tri Only one atom of nitrogen - so no prefix needed hydroge n nitroge trihydrid
n e More Common Name is ammonia Example 6 CH4 tetra
Only one atom of carbon- so no prefix needed hydroge n carbo tetrahydrid n e More Common Name is methane
Example 7-9 Example 7: As2O3 Diaresenic trioxide Example 8: N2O5 Dinitrogen pentoxide Example 9: P4O10 Tetraphosphorus decaoxide
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