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The molecular electronic configuration of B₂ is

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

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

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

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

answer is A.

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Detailed Solution

B₂(10e^-) : ${(σ 1 s)}^{2} {(σ^{*} 1 s)}^{2} {(σ 2 s)}^{2} {(σ^{*} 2 s)}^{2} {(π 2 p)}_{x}^{1} {(π 2 p)}_{y}^{1} (o r) KK {(σ 2 s)}^{2} {(σ^{*} 2 s)}^{2} {(π 2 p)}_{x}^{1} {(π 2 p)}_{y}^{1}$

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