Question

31.
How is molecular orbital different from atomic orbital? Give electronic configuration of
1. H2
ii. Li2
iii. B2
iv. C2.
Calculate their bond order and predict their magnetic behaviour.​

Answer 1

molecular orbital is different from atomic orbital by following means -

• Atomic orbitals are formed by the electrons present around the atom . while molecular atoms are formed by the fusion of atomic orbitals having nearly same energy.

• Atomic orbital is the region where finding the probability of electron in an atom is high , while for molecular orbital finding the probability of electron in a molecule is high.

Electronic configuration of -

1) H2 - σ1s²

• Bond order - 1 , diamagnetic as no unpaired electron.

2)Li2- σ1s²σ∗1s²σ2s²

• Bond order- 1 ,diamagnetic as no unpaired electron.

3)B2 - σ1s²σ∗1s²σ2s²σ∗2s²σ2px¹=σ2py¹

• Bond order- 1,paramagnetic as have 2 unpaired electron.

4)C2 - σ1s²σ∗1s²σ2s²σ∗2s²σ2px²=σ2py² .

• Bond order- 2 ,diamagnetic as no unpaired electron.