1. Unit 6: Nomenclature - Part II
Covalent Compounds
Unit 6: Nomenclature - Part II

2. How do I name a covalent compound?
Lesson Essential Questions:
How do I name a covalent compound?
How do I write a formula for a covalent compound?

3. Writing Names of Binary Molecular Compounds
Ex. P2O5
Writing Names of Binary Molecular Compounds di
phosphorus
penta
oxide
1. BM compounds use prefixes in their name. These are determined by the subscripts in the formula.
You know it is a Binary Molecular Compound because it contains two elements and both are nonmetals.
2. Write the name of the first element after the prefix.
1 – mono – di
3 – tri – tetra
5 – penta 6 – hexa
7 – hepta 8 – octa
9 – nona deca
3. Write the prefix of the second element.
4. Write the name of the second element changing the
ending to –ide.

4. Writing Names of Binary Molecular Compounds
Ex. S2O10
Writing Names of Binary Molecular Compounds di
sulfur
deca
oxide
1. BM compounds use prefixes in their name. These are determined by the subscripts in the formula.
2. Write the name of the first element after the prefix.
1 – mono – di
3 – tri – tetra
5 – penta 6 – hexa
7 – hepta 8 – octa
9 – nona deca
3. Write the prefix of the second element.
4. Write the name of the second element changing the
ending to –ide.

5. Writing Binary Covalent Formulas
Ex. Nitrogen Trihydride
Write the formula for the first and second element.
2. Write subscripts for the prefixes in the name. N H 3

6. Writing Binary Covalent Formulas
Ex. Diarsenic Pentaoxide
Write the formula for the first and second element.
2. Write subscripts for the prefixes in the name. As O 2 5