Structure of methane, CH4. There are four bonded domains on C and no lone pairs, giving tetrahedral electron-domain and molecular geometries (AX4).
Shown below is a tetrahedron, the geometric shape for which the term "tetrahedral geometry" was derived. A tetrahedron has four triangular faces formed by connecting lines between the four unique sets of three vertex corners. A molecule with four electron domains on a central atom can be superimposed on a tetrahedron, with the central atom (C) occupying the center of the tetrahedron, and the electron pairs pointing towards the four vertex corners.
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