Question

Which of the following molecules/ions does not contain unpaired electrons?

Options

• \[\ce{O^{2-}2}\]

• B₂

• \[\ce{N^{-}2}\]

• O₂

Answer 1

\[\ce{O^{2-}2}\]

Explanation:

\[\ce{O^{2-}2}\] (Number of electrons = 18 excludes unpaired electrons)

\[\ce{O^{2-}2}\] = σ1s², σ*1s², σ*2s², σ2p_z², π2p_z² ≈ π2p_y² π*2p_x² ≈ π*2p_y²