which of the follwing do not exist 

He2

HeH+

Be2

Asked by abnarsale | 31st Dec, 2021, 10:41: AM

Expert Answer:

Be2 doesn't exist because according to molecular orbital theory, if we look at the electronic configuration.

Electronic configuration is-  

KK space left parenthesis σs right parenthesis squared space left parenthesis straight sigma asterisk times 2 straight s right parenthesis squared space
space The space bond space order space is space equals space fraction numerator 2 minus 2 over denominator 2 end fraction equals 0

Molecule which is having bond order is zero can not exist.

Answered by Ravi | 31st Dec, 2021, 12:36: PM