A combination of atomic orbitals on the same atom, resulting in a blended wave function with new directional properties.

sp hybrid orbitals: A set of one-electron wavefunctions constructed from one s function and one p function on the same atom. The two sp orbitals, spaced 180 degrees apart, face in opposite directions.

sp2 hybrid orbitals : A set of one-electron wave functions constructed from one s function and two p functions on the same atom. The three sp2 orbitals, spaced 120 degrees apart, point toward the vertices of an equilateral triangle.

sp3 hybrid orbitals : A set of one-electron wave functions constructed from one s function and three p functions on the same atom. The four sp3 orbitals, spaced 109.5 degrees apart, point toward the vertices of an rectangular tetrahedron.

sp3d2 hybrid orbitals : A set of one-electron wave functions constructed from one s function, three p functions, and two d functions on the same atom. The six sp3d2 orbitals, spaced 90 degrees apart, point toward the vertices of an regular octahedron.