The atomicity of a homonuclear molecule can be found by the ratio of

There is a simple way to determine the

atomicity

of any

homonuclear molecule

. It can be determined as a ratio of

molecular weight

and

atomic weight

, i.e., (M.W/A.W.).

For example, the

molecular

weight of oxygen is 31.999, while its

atomic

weight is 15.999. On dividing the two, we get

atomicity

as (31.9/15.9) which is roughly equal to 2.