A simple case is that of the linear molecule.
Unlike linear molecules, circular chromosomes are able to replicate the entire molecule.
So if you make a linear molecule out of three iodides, well, you've got an "extra" lone pair.
This consists, basically, of, in other words it is a linear long-chain molecule much like Figure 7.
Some lipids are linear aliphatic molecules, while others have ring structures.
However, in practice only the existence of two degrees of rotational freedom for linear molecules will be considered.
For example in linear molecules each energy level is split into J+1 components.
So atoms and linear molecules have zero permanent electric dipole moments.
The sizes (kbp) are indicated from the left end of the linear molecule.
For a linear molecule, the number of vibrational modes is: