Why N2 is more stable than O2. Explain on the basis of Molecular Orbital Theory

Nitrogen molecule has 14 electrons. So the electron distributions in molecular orbital are as below

N

_{2}= σ1s

^{2}σ*1s

^{2}σ2s

^{2}σ*2s

^{2}σ2p

_{x}

^{2}π(2p

_{y}

^{2}2p

_{z}

^{2})

Bond order = (No. of electrons in bonding orbitals - No. of electrons in bonding orbitals)/2

=(10-4)/2 = 3

Oxygen molecule has 16 electrons. So the electron distributions in molecular orbital are as below

O

_{2}= σ1s

^{2}σ*1s

^{2}σ2s

^{2}σ*2s

^{2}σ2p

_{x}

^{2}π(2p

_{y}

^{2}2p

_{z}

^{2}) π*(2p

_{y}

^{1}2p

_{z}

^{1})

Bond order= (10-6)/2 = 2

As bond order of nitrogen is more than that of oxygen, nitrogen is more stable than oxygen.

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