1.

Use molecular orbitals theory to explaiin why the Be_(2) molecular does not exist .

Answer»

Solution :E.C. of `._(4) Be = 1s^(2) 2s^(2)`
M.O.E.C. of ` Be_(2) = SIGMA _(1s)^(2) sigma_(1s)^(2) sigma_(2s)^(2) sigma_(2s)^(2)`
`THEREFORE ` Bond ORDER = `(1)/(2) (4-4) = 0 `. Hence , `Be_(2)` does not exist .


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