https://doi.org/10.1351/goldbook.R05175
A factor that is introduced into rate theory to take account of the fact that the process may be able to occur in different but equivalent ways. Thus the process:
R05175.png
has a @[email protected] @[email protected] of 2 since the chlorine atom can abstract either of the two hydrogen atoms in the hydrogen molecule. The @[email protected] @[email protected] has also been referred to as the statistical factor for the reaction.