The process of mixing of the atomic orbitals to form new hybrid orbitals is called hybridization. All hybrid orbitals of a particular kind have equal energy, identical shapes and are symmetrically oriented in shape.
(i) s-hybridized orbitals are oriented in shape at an angle of 180°.
(ii) sp2-hybrid orbitals lie in a plane and directed towards the corners of equilateral triangle with an angle of 120°.
(iii) sp3 hybrid orbitals are directed towards the four corners of a tetrahedron.