1. Naming Binary Molecular Compounds 2 elements covalent bond

2. 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 Sulfur Hydrogen Oxide Sulfide Hydride

3. 3. Add a prefix to both words to indicate the number of atoms 1.mono-6. hexa- 2.di-7. hepta- 3.tri-8. octa- 4.tetra-9. nona- 5.penta-10. deca-

4. 2 Exceptions to the rule 1. When the formula contains one atom of the first element, omit mono ex: CO 2 Carbon Dioxide Not: Monocarbon Dioxide

5. 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

6. Example 1 S 4 N 2 sulfurnitrogen tetradi nitride tetrasulfurdinitride

7. Example 2 SO 3 Only one atom of sulfur sulfur - so no prefix needed oxide tri oxygen tri

8. Example 3 P 4 S 5 tetrasulfide penta sulfur penta tetra phosphorus

9. Example 4 CO Only one atom of carbon carbon - so no prefix needed oxide mono oxygen mon NOT monooxide

10. Example 5 NH 3 Only one atom of nitrogen nitrogen - so no prefix needed hydride tri hydrogen tri More Common Name is “ammonia”

11. Example 6 CH 4 Only one atom of carbon carbon - so no prefix needed hydride tetra hydrogen tetra More Common Name is “methane”

12. Example 7-9 Example 7: As 2 O 3 Diaresenic trioxide Example 8: N 2 O 5 Dinitrogen pentoxide Example 9: P 4 O 10 Tetraphosphorus decaoxide