Problem: Write the formula for each molecular compound.phosphorus pentafluoride

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We’re being asked to write a chemical formula for phosphorus pentafluoride.


A covalent or molecular compound is composed of more than one nonmetal together.

Rules for naming molecular compounds:

1. The first nonmetal is named normally and uses numerical prefixes except mono.
2. The second nonmetal keeps its base name but has its ending changed to -ide.

Numerical Prefixes:

Mono              1                     Di                    2
Tri                   3                     Tetra               4
Penta             5                      Hexa              6
Hepta             7                      Octa               8
Nona              9                      Deca              10

*numbers are written as subscripts of the element in the chemical formula

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Problem Details

Write the formula for each molecular compound.

phosphorus pentafluoride

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Naming Covalent Compounds concept. You can view video lessons to learn Naming Covalent Compounds. Or if you need more Naming Covalent Compounds practice, you can also practice Naming Covalent Compounds practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Henricks' class at KSU.