Use molecular orbital theory to explain why the Be2 molecule does not exist.
The electronic configuration of Beryllium is 1s22s2. Hence, the bond order for Be2 is 12(Nb−Na) Where, Nb = Number of electrons in bonding orbitals Na = Number of electrons in anti-bonding orbitals ∴ Bond order ofBe2 =12(4−4) = 0 A negative or zero bond order means that the molecule is unstable. Hence, Be2 molecule does not exist.
