1.

The molecular electronic configuration of B_2 is

Answer»

`KK(SIGMA2S)^2(sigma^ast2s)^2(pi2p_x^1=pi2p_y^1)`
`KK(sigma2s)^2(sigma^ast2s)^2(pi2p_x)^2`
`KK(sigma2s)^2(sigma^ast2s)^2(sigma2p)^2`
`KK(sigma2s)^2(sigma^ast2s)^2(sigma2p)^1(PI2P)^1`

Answer :A


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