Question

Explain the formation of O2 molecule by Molecular Orbital Theory (M.O.T).

Answer 1

The electronic configuration of o2 in ground state is 1s2 2s2 2p4. So ,In o2 molecule there are 16 electrons . the further explanation is given in the picture.
and it has two unpaired electrons. so it is Paramagnetic in nature

Answer 2

Molecular orbital diagram for $O_2$ molecule

Explanation:

• Each oxygen atom has 8 electrons. Therefore, there are 16 electrons in oxygen molecule.
• Due to the combination of atomic orbitals of the two atoms, ten molecular orbitals are formed.
• These are filled in the increasing order of their energy by following the following rules:

1. The molecular orbitals are arranged in the increasing order of their energies. The molecular orbital with lowest energy is filled first as per the aufbau principle.
2. Each molecular orbital can accommodate a maximum of two electrons with opposite spins as per the Pauli's exclusion principle.
3. If there are two or more molecular orbitals of same energy, these are the first singly filled and then pairing starts as per the Hund's rule.

• The diagram of oxygen molecule based on molecular orbital theory is given in the attachment.

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