representing formulae

Molecular formula

The exact number of atoms of each element present in the molecule

Empirical formula

Simplest whole number ratio of atoms in molecule

Structural formula

Minimal detail using conventional groups for an unambiguous structure

Displayed formula

Shows relative placing of atoms and number of bonds between them in a diagram

Skeletal formula

Used to show simplified organic formula by removing hydrogen atoms from the chain, leaving a carbon skeleton and associated functional groups

General formula

Represents any member of a homologus series

What is a homologus series

Series of compounds which each member differs from the next by a common repeating unit of CH2

What is a functional group

An atom or group of atoms responsible for the characteristics of a compound