The correct option is the electron density in the internuclear region in bonding molecular orbital is very low. Explanation & Key Takeaways: • Bonding molecular orbitals can form by the addition of two or more atomic orbitals. • The wavefunction of atoms is called bonding molecular orbitals. • The bonding molecular orbital has lower energy and higher stability. • If we add two 1s orbitals we will get a new sigma 1s bonding orbital. • This sigma-bonding orbital has no nodal plane. • As it has no nodal plane along the internuclear axis, the electron density is zero. • Thus, option c is incorrect as the electron density is zero and not very low. Related Concepts: • In molecular orbital theory, the atomic orbitals get combined to form a new molecular orbital. • Robert S. Mullikan discovered the molecular orbital theory. • In molecular orbital theory, the antibonding orbitals are shown at higher energy levels and the bonding orbitals are shown at a lower energy level. • The antibonding orbitals are represented by an asterisk symbol with sigma and pi orbitals.