1. Nomenclature
Element – A unique form of matter that serves as a building material for more complex matter. Elements cannot be broken apart into two different substances.
-Each element has a name and a chemical symbol
Ex: Gold – Au, Silver – Ag, Hydrogen – H
-A symbol is never more than two letters and the first letter is always capitalized (some symbols have only one letter)

2. Nomenclature Important to note: CO vs. Co and HF vs. Hf
NOTE THE DIFFERENCE!
CO – carbon AND oxygen
Co – cobalt
HF – hydrogen AND flourine
Hf - hafnium

3. Nomenclature (s) – (l) – (g) – (aq) – solid liquid gas aqueous
(dissolved in water)

4. Nomenclature Note the subscripts!
Chemical Formula – A set of symbols a chemist uses to represent a compound. Carbon dioxide is a compound and has the chemical formula CO2
Compound – A substance that consists of two or more elements chemically combined together
-Some groups of elemental symbols have names
Ex: OH – hydroxide, NO3 – nitrate
Note the subscripts!

5. Nomenclature Names for Type I Binary Ionic Compounds
There are usually two parts to the formula.
Ex. NaCl  Na (sodium) and Cl (chlorine)
For the first part of the name, simply write the element name.
For the second part of the name, add “-ide” to the end of an element. Ex. chlorine  chloride
Special Rule!
Some second parts of names are compounds. Use the names next to the compounds:
NO3 – nitrate SO4 – sulfate OH – hydroxide

6. Using the Language of Chemistry
Problems:
Write the names of the following compounds:
1. Al(NO3)3
2. Ho
3. CaCl2
4. Np
5. MnS2
6. Cf
7. LiBr
8. Na2O
9. No
10. K2SO4
11. NaOH
12. Hs
Answers:
1. aluminum nitrate
2. holmium
3. calcium chloride
4. neptunium
5. manganese sulfide
6. californium
7. lithium bromide
8. sodium oxide
9. nobelium
10. potassium sulfate
11. sodium hydroxide
12. hassium