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why He2 does not exist?

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why He2 does not exist?

    • Posted by Jerry Nongspung 6 years, 8 months ago

    CBSE > Class 11 > Chemistry
    • 3 answers

    Priya Dharshini ? 6 years, 8 months ago

    Wlcm

    1Thank You

    Ankit Singh 6 years, 8 months ago

    Thanks for the answer priya

    3Thank You

    Priya Dharshini ? 6 years, 8 months ago

    Helium and the other inert gases have completely filled octets, and so they have zero valency. That means, their combining capacity is zero, and so they exist as monatomic molecules such as He, Ne, Ar etc. Helium atom has the electronic configuration 1s2. According to the molecular orbital theory, in a supposed He2 molecule, both the bonding and the antibonding orbitals will have 2 electrons each. And so, the bond order (half the difference in the numbers of bonding and antibonding electrons) for such a diatomic entity is zero. That means, the He2 molecule has no existence.

    2Thank You

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