In
chemistry, trigonal planar is a
molecular geometry with one atom at the center and three atoms at the corners of a triangle all in one plane. In a trigonal planar molecule where all three attached atoms are identical, all bond angles will be 120° and the molecule will belong to
point group D3h. Molecules where these atoms differ − such as
H2CO − as well as more complex molecules − such as alkenes − will deviate from this ideal geometry due to lowered
molecular symmetry. In general the atomic orbitals of a trigonal planar molecule are
sp2 hybridized.
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A molecular shape that results when there are three bonds and no
lone pairs around the central atom in the molecule. The pairs are arranged along the central atom's equator, with 120° angles between them. The carbonate ion (CO32-) has a trigonal planar geometry.
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