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Question

Which of the following should be most stable?

A
He2
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B
H2
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C
He+2
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D
H+2
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Solution

The correct option is B H2
Bonding orbitals have 2 electrons in H2. The configuration is 1s2. Rest all have electrons in antibonding orbitals.
For He2, electronic configuration is 1s21s2.
For He+12, electronic configuration is 1s21s1.
For H+12, electronic configuration is 1s1. This has fractional bond order. Hence, it is unstable.

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