1. Inorganic nomenclature Nomencalture

2. Writing Formula of Ionic Compounds
Formula is representation of the composition of a substance showing the symbol of the elements and the number of atoms of each elements in the compound.
Ionic compounds are compounds of metals and non-metals
Formula of ionic compound shows the ratio of ions
The ratio will always be in lowest terms.
The charges on ions must balance to become neutral

3. Metals and Non-metals Lithium oxide
Find both elements in the periodic table, write symbol of ions with charges
Add either positive or negative ions (or both) to balance out the charges

4. Now write the formula to show how much of each element is needed to balance out the charges Potassium Nitride

5. Ionic compounds with Polyatomic Ions
Calcium Nitrate

6. Metals with more than one combining capacity
If metal has more than one combining capacity, we are told in the chemical name
Lead(ll)oxide
Lead(lV)oxide

7. Writing names of ionic compounds
Write the name of metal first and non-metal ion second.
For simple ionic compounds, change non-metal ending to IDE
NaBr
Al2 O3

8. Write names of ionic compounds with more than one combining capacity
If a metal has more than one combining power, you must show the combining power with a roman numeral Start with the ion which we do know. Work backward to know the charge of metal ion FeCl3

9. PbO
PbO2

10. Polyatomic Ions Polyatomic ions: do not change ending of ion NaNO3
NH4 HCO3

11. Hydrates
Hydrate: an ionic salt that has water associated with it ( in its crystalline form)
e.g. CuSO H2 O
each formula unit of copper sulphate has 5 water molecules attached to it
Named just like ionic compounds, except…
– the Greek prefixes are added at the end with the word “hydrate” to show how many water molecules are present

12. Greek Prefixes Prefixes used No. Of water molecules mono hexa di hepta
tri
octa
Tetra
nona
penta
deca

13. Zn (CH3CHOO) 2 .2 H2O
Ni3 (PO4)2 . 8H2 o

14. Iron(II)Phosphate octahydrate
Aluminum nitrate nonahydrate:

15. Covalent Bonds
To write the formula of a covalent bond, the most metallic element usually goes first
The formula tells us what is in a molecule of the compound so it is not reduced to the lowest term
The first word is just the name of the first element with a prefix ( mon, di, tri, tetra, etc)

16. Prefixes tell us how many of each atom are present in a molecule
When naming covalent compounds mono is not needed in the first element name
Name of second element ends in ide
Example:
ICI
S4N2

17. BrF
P2O6

18. Tetraphosphorus trisulphide
Trisilicon tetranitride
Oxygen difluoride