According to molecular orbital theory, which of the following will not

1.	According to molecular orbital theory, which of the following will not be a viable molecule ?
Answer» `He_(2)^(2-)` `He_(2)^(+)` `H_(2)^(-)` `H_(2)^(2-)` SOLUTION :Both `H_(2)^(2+) (2e^(-)) : SIGMA 1 s^(2) , B.O. 2//2=1` ` H_(2)^(2+) (3e^(-)):sigma 1 s^(2) sigma^() 1 s^(1) , B.O. = (2-1)/(2) = 0.5` `H_(2)^(-) (3e^(-)): sigma 1 s^(2) sigma^()1 s^(1) , B.O. = (2-1)/(2) = 5.0` `H_(2)^(2-) (4e^(-)): sigma 1 s^(2) sigma^(**)1 s^(2) , B.O. = (2-2)/(2) = 0` THUS , `H_(2)^(2-)` connot exist as it has zero BOND order

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