In a
tetrahedral molecular geometry, a central
atom is located at the center with four
substituents that are located at the corners of a
tetrahedron. The
bond angles are cos
-1(
-1/3) =109.4712206...° ˜ 109.5° when all four substituents are the same, as in
methane (CH
4). The perfectly symmetrical tetrahedron belongs to
point group T
d, but most tetrahedral molecules are have
lower symmetry. Tetrahedral molecules can be
chiral.