$\mathrm{H}_{2}$ molecule is more stable than $\mathrm{Li}_{2}$ molecule, because

$\mathrm{H}_{2}$ molecule is more stable than $\mathrm{Li}_{2}$ molecule, because
  1. In $\mathrm{H}_{2}$ molecule $\sigma_{15}$ molecular orbitals are shielded by electrons.
  2. In $\mathrm{H}_{2}$ bond order is one.
  3. In $\mathrm{Li}_{2}$ molecule $\sigma_{1 \mathrm{~s}}$ molecular orbitals are shielded by electrons.
  4. In $\mathrm{Li}_{2}$ molecule, outer $\sigma_{2 \mathrm{~s}}$ molecular orbitals are shielded by the inner electrons.

Solution

In $\mathrm{Li}_{2}$ molecule, outer $\sigma_{2 \mathrm{~s}}$ molecular orbitals are shielded by the inner electrons.

Asked in: MHT CET 2020 (12 Oct Shift 1)

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