A sigma bond is the strongest type of covalent bond, formed by the direct, head-on overlap of atomic orbitals. This direct overlap creates a single bond that permits free rotation of the bonded atoms, forming the backbone of most molecules.
A sigma bond is the strongest type of covalent bond, formed by the direct, head-on overlap of atomic orbitals. This direct overlap creates a single bond that permits free rotation of the bonded atoms, forming the backbone of most molecules.