A trigonal structure with an ideal bond angle of 120° results from a structure with a central atom with three electron groups.
A triangular planar molecule is a molecule with three bonds and an O lone electron pair. A molecule is angular if it has three bonds and one lone pair of electrons. A tetrahedral molecule is a molecule that contains four bonds and no lone pairs. A molecule is a triangular pyramid if it contains four members and a pair of electrons.
If a structure has four atoms, none of which are lone pairs, and the core atom is surrounded by three other atoms, the structure has a trigonal molecular structure. Four atoms are arranged in one plane.
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