How to Name a Molecular Compound: A Step-by-Step Guide
Naming molecular compounds is a fundamental skill in chemistry that helps scientists and students communicate precisely about substances composed of multiple elements bonded covalently. Unlike ionic compounds, which use charges to determine formulas, molecular compounds rely on prefixes to specify the number of atoms of each element present. This guide explains the rules and steps for naming molecular compounds, ensuring clarity and accuracy in chemical communication.
Easier said than done, but still worth knowing.
Steps to Name a Molecular Compound
1. Identify the Elements in the Compound
Start by determining the two elements involved in the compound. Molecular compounds are formed by two nonmetals sharing electrons through covalent bonds. As an example, in CO₂, carbon and oxygen are the elements.
2. Assign Prefixes Based on Atom Count
Use Greek-derived prefixes to indicate the number of atoms of each element:
- 1 = mono-
- 2 = di-
- 3 = tri-
- 4 = tetra-
- 5 = penta-
- 6 = hexa-
- 7 = hepta-
- 8 = octa-
- 9 = nona-
- 10 = deca-
Important: The first element always includes its prefix, even if there is only one atom. Take this case: CO is named carbon monoxide, not “carbon oxide
