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NEET-XI-Chemistry

04: Chemical Bonding and Molecular Structure

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  • #35
    Use molecular orbital theory to explain why the Be2 molecule does not exist.
    Ans : The electronic configuration of Beryllium is.

    The molecular orbital electronic configuration for Be2 molecule can be written as:



    Hence, the bond order for Be2 is

    Where,

    Nb = Number of electrons in bonding orbitals

    Na = Number of electrons in anti-bonding orbitals

    Bond order of Be2 = 0

    A negative or zero bond order means that the molecule is unstable. Hence, Be2 molecule does not exist.