When the 1s and 3p atomic orbitals combine to form a "mix" of four fully equivalent molecular orbitals, this is referred to as sp3 hybridization. Its geometry will be tetrahedral.
The theory known as VSEPR, or Valence Shell Electron Pair Repulsion theory, explains the relationship between the quantity of electron pairs and geometry.
There should be a linear geometry for two pairings (angle 180 degrees)
A flat triangular geometry for three pairs is anticipated (angle 120 degrees)
Additionally, VSEPR predicts the electron shape for electron pairs with greater than four.
Each of the four orbitals has one electron pair, which will resist one another. When the couples take the vertices of a tetrahedron, the distance between them is best maximized. That is the geometry they use which is tetrahedral.
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