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Hybridisation is based on the fundamental principle of Valence Bond Theory. It is the mixing of atomic orbitals to form new hybrid orbitals with different shapes and properties. The hybrid orbitals formed determine the molecular shape, bond angles, and properties of the molecule. For example, in methane (CH4), the carbon atom undergoes sp3 hybridisation, where one 2s orbital and three 2p orbitals combine to form four equivalent sp3 hybrid orbitals. These hybrid orbitals then overlap with the 1s orbitals of four hydrogen atoms to form four C-H sigma bonds, resulting in the tetrahedral geometry of methane.