Tetrahedral Definition - Chemistry Glossary

Tetrahedral shape
A tetrahedral molecule has a central atom with four bonds, forming a tetrahedron.

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Tetrahedral is a descriptor of the geometry of a molecule in which a central atom forms four bonds which are directed toward the corners of a regular tetrahedron. Tetrahedral geometry forms a solid with four vertices and four sides, all of which are equilateral triangles.

Examples of tetrahedral molecules include methane (CH4) and the ammonium ion (NH4+). The bond angle for both methane and ammonium is 109.4˚.