2. Remember Covalent Compounds  Composed of two or more nonmetals.  Usually gases or liquids at room temperature.  Non-electrolytes: do not conduct electricity when dissolved in water

3. Rule 1  The most “metallic” element is written first. This is the least electronegative element.  Exception: when the compound contains oxygen and a halogen, the name of the halogen is the first word in the name.

4. Rule 2  The second element in the name is named as if it was an anion, by adding the suffix -ide to the name of the element.  The first elements name stays the same

5. Rule 3  Greek prefixes are used to indicate the number of atoms of each nonmetal element present.  The prefix mono is only used for oxygen

6. Greek Prefixes You use most of these regularly. For example: You use most of these regularly. For example: What do you call a train that runs on one rail? What do you call a train that runs on one rail?

7. MONORAIL

8. A choice between two options is a …

9. dilemma

10. What do you call the non-motorized object that has pedals and 3 wheels? What do you call the non-motorized object that has pedals and 3 wheels?

11. Tricycle Tricycle

12. How many blocks in each tetris piece?

13. Tetra = 4

14. What is the name of the 5 sided building in Washington DC?

15. pentagon

16. What are these?  HEX nuts  Hexa = 6

17. hepta

18. octa

19. nona

20. deca

21. Greek Prefixes Here is an example of how we use the prefixes with the elements to name compounds.

22. Some important exceptions to remember  All diatomic (gen-u-ine) elements are just named for their element  Ex: O 2 = oxygen  Other exceptions are methane CH 4 and ammonia NH 3  And carbon and hydrogen compounds

23. Practice Example #1: N 2 O 4 :_________________ Example #2: SF 6 :___________________ Example #3: diphosphorus pentoxide:______ Example #4: phosphorus pentachloride :_______ Dinitrogen tetraoxide