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26 February, 13:14

In h2-, how many electrons occupy the mo shown?

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  1. 26 February, 17:11
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    Atomic number of H = 1

    Valence electron configuration = 1s¹

    When 2 H atoms combine, two 1s orbitals overlap resulting in the formation of a sigma bond.

    H₂ Molecular configuration = σ1s²

    In H₂⁻ there is an addition of 1 electron which goes to occupy the σ * antibonding orbital:

    H₂⁻ = σ1s² σ*1s¹

    Thus, 3 electrons will occupy the MO of H2⁻ in which:

    2 electrons are bonding

    1 electron antibonding
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