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Question

Why He2 molecule does not exist? Explain by MOT.

Solution
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Electronic configuration of He is 1s2.
Molecular Orbital Diagram for He2 is
(Refer to Image)
Bond order= (No. of electrons in bonding molecular orbital)-(No. of electrons in anti-bonding Molecular orbital)2
=222=0
He2 bond order is 0. There is no bond existing between atoms of He2. So He2 does not exist.

1189754_1121499_ans_2039813e23c7487e8bb54085be76a4cd.JPG

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