1.

Which one of the following species does not exist under normal conditions ?

Answer»

`Li_(2)`
`Be_(2)^(+)`
`Be_(2)`
`B_(2)`

SOLUTION :`Be_(2) = sigma _(1S)^(2) sigma _(1s)^(**2) sigma_(2s)sigma _(2s)^(**2)B.O. = 0 ` ,


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