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Molecular electronic configuration of $B_{2}$ is

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$KK (σ 2 s)^{2} {(σ^{*} 2 s)}^{2} (π 2 p)_{x}^{2}$

$KK (σ 2 s)^{2} {(σ^{*} 2 s)}^{2} (σ 2 p)^{1} (π 2 p)^{1}$

$KK (σ 2 s)^{2} {(σ^{*} 2 s)}^{2} (π 2 p)^{2}$

$KK (σ 2 s)^{2} {(σ^{*} 2 s)}^{2} (π 2 p)_{x}^{1} (π 2 p)_{y}^{1}$

answer is A.

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Detailed Solution

$B_{2} (10 e^{-}) = σ 1 s^{2} σ^{*} 1 s^{2} σ 2 s^{2} σ^{*} 2 s^{2} (π 2 p_{x}^{1} = π 2 p_{y}^{1}) = KK σ 2 s^{2} σ^{*} 2 s^{2} (π 2 p_{x}^{1} = π 2 p_{y}^{1})$

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