Trigonal planar molecular geometry

Trigonal planar molecular geometry is a type of molecular geometry. An atom in a molecule has this geometry if it is connected by chemical bonds to three other atoms, which form an approximately equilateral triangle in the same plane as the central atom.

If the central atom is not in the same plane as the outer atoms, it is trigonal pyramidal molecular geometry, and if the outer atoms form a right triangle, it is T-shaped molecular geometry.

Trigonal planar molecular geometry usually occurs when the central atom has no lone pairs. In AXE notation, these are AX₃ molecules. These molecules are usually Lewis acids.

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v t e Molecular geometry
VSEPR theory Coordination number
Coordination number 2	Linear Bent
Coordination number 3	Trigonal planar Trigonal pyramidal T-shaped
Coordination number 4	Tetrahedral Square planar Seesaw
Coordination number 5	Trigonal bipyramidal Square pyramidal Pentagonal planar
Coordination number 6	Octahedral Trigonal prismatic Pentagonal pyramidal
Coordination number 7	Pentagonal bipyramidal Capped octahedral Capped trigonal prismatic
Coordination number 8	Square antiprismatic Dodecahedral Bicapped trigonal prismatic
Coordination number 9	Tricapped trigonal prismatic Capped square antiprismatic
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