# If the bond angles at a carbon atom are 120°, how many groups are distributed around the carbon atom?

A $\angle R - C - R$ of ${120}^{\circ}$ specifies $s {p}^{2}$ hybridization. This carbon centre should thus possess trigonal planar geometry to a first approximation, and thus we got ${R}_{2} C = C \ldots \ldots \ldots$