Depiction of bonding orbitals in ammonia. Sigma bonding between hydrogen s orbitals and three of the nitrogen sp³ hybrids. Lone pair occupies other sp³ orbital.

Depiction of bonding orbitals in ethane. Sigma bonding between hydrogen s orbitals and three of the carbon sp³ hybrids. Sigma bond between remaining carbon sp³ and other carbon remaining sp³.

Depiction of bonding orbitals in ethene. Sigma bonding between hydrogen s orbitals and two of the carbon sp² hybrids. Sigma bond between remaining carbon sp² and other carbon remaining sp². Pi bond between unhybridized p orbitals of carbons.

Depiction of bonding orbitals in ethyne. Sigma bonding between hydrogen s orbitals and one of the carbon sp hybrids. Sigma bond between remaining carbon sp and other carbon remaining sp. Two pi bonds between the two unhybridized p orbitals of each carbon.

Depiction of bonding orbitals in methanal. Sigma bonding between hydrogen s orbitals and carbon sp² hybrids. Sigma bond between carbon sp² and oxygen sp² (lone pairs occupy other sp² orbitals). Pi bond between p orbitals of carbon and oxygen.