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He2 cannot exist as stable molecule. Jus...

`He_2` cannot exist as stable molecule. Justify this statement on the basis of bond order.

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The electronic configuration of `He_2` is `sigma_(1s)^2 sigma^*_1s^2`
Bond order = `1/2(N_b-N_a)` = 1/2(2-2) = 0, hence cannot exist
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