1. Writing and Naming Chemical formulas

2. Vocabulary Monoatomic ion - single atom with a charge ex:
Polyatomic ion - group of two or more atoms, bonded together, with an overall charge ex:
Ionic compound - substance containing two types of ions, positive and negative, bonded together, having an overall charge of zero

3. Vocab and hints, continued
Subscript - number written below and to the right of an atom or group of atoms (in parentheses), indicating how many of that atom/s are present in a compound.
The positive charge in a compound must equal the negative charge
Transition metals have charges that match the Roman numeral in their name
ex:

4. Writing Ionic Formulas
Determine which ions are present.
Write the positive ion first, negative ion last (include charges - to start)
Cross the charges to make subscripts on the opposite ion (1s are left blank in the end)
Add parentheses on polyatomic ions if there are more than one of that ion
Erase charges to complete the formula

5. Practice 1
Lithium Oxide
Calcium Flouride

6. Practice 2 (w/polyatomic ions)
Calcium phosphate
Ammonium nitride

7. Practice 3 (transition metals)
Lead (II) bromide
Copper (I) sulfate

8. Practice 4 (your turn) Sodium sulfide Aluminum nitrate
Iron (II) chloride
Ammonium hydroxide
Strontium sulfate
Potassium oxide
Tin(IV)fluoride

9. Nomenclature

10. Naming Ionic Compounds
Binary (type 1): metal can only form one type of cation.
Name metal (positive) ion first
Name nonmetal (negative) ion last
Ex:

11. Naming Ionic Compounds
Binary (type II): Metal can form two or more cations with different charges (transition metal or Pb or Sn)
Name metal (positive) ion first
Roman numeral (representing the charge on the metal) in parentheses
Name nonmetal (negative) ion last
Ex:

12. Practice:
Ca3P2
MgI2
CsBr
CuCl
PbO2
CoCl2

13. Naming ternary compounds
Name first ion
Name second ion
Insert Roman numeral if needed
(Remember, there can only be two types of ions in any ionic compound!)

14. Naming binary compounds containing only nonmetals
Name first element –full element name is used
Name second element as if it were an ion (suffix “-ide”)
Add numerical prefixes to tell the numbers of atoms present
“mono” prefix is not used for the first element

15. Prefixes for nonmetallic binary compounds
1 – mono
2 – di
3 – tri
4 – tetra
5 – penta
6 – hexa
7 – hepta
8 – octa
9 – nona
10 – deca

16. Examples:
BF3 NO
N2O5

17. Writing Molecular Formulas
Write symbol of both elements
Prefixes tell the number of the subscript on each element
Example: ____carbon tetrachloride
One carbon, four chloride

18. Binary Acids Compounds containing only hydrogen and one other element
Prefix “hydro-”
Suffix “-ic”
Ex:

19. Ternary Acids
Compounds containing hydrogen and a polyatomic negative ion containing oxygen
No Prefix
If ion ends in “-ite”, acid ends in “-ous”
Ex:

20. Ternary acids (cont.) No prefix
If ion ends in “-ate” acid ends in “-ic”
Ex:

21. Acid examples: H2SO4 HBr H3PO3 Hydroiodic acid Perchloric acid
Sulfurous acid