1.

According to molecule orbital theory, which of the following will not be a viable molecule-

Answer»

`H_(2)^(-)`
`H_(2)^(2-)`
`He_(2)^(2+)`
`He_(2)^(+)`

Solution :MO electronic configuration of `H_(2)^(2-):(sigma_(1s))^(2)(sigma_(1s))^(2)`
`therefore`BOND order=`(2-2)/(2)=0`
Since, bond order of `H_(2)^(2-)` is 0, it does not exist.


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