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H2 and H2+ why diffrent bond lengths

Submitted by Anonymous (not verified) on Fri, 07/18/2008 - 10:27

Hello I would really appreciate if someone explained this to me:

Why is it that H2 has a shorter bond distance and Higher Bonf Energy than H2+?

I know its to do with the fact that H2+ has one less electron than H2 and its something to do with nuclear attraction but I'm not clear on it....

Thanks Very Much!

Morley xxx


a bond results from the attraction of electrons by two nucleii.  In the H2 molecule there are 2 electrons being attracted by two nucleii (where each H nucleii is a proton).  In H2+ there is only 1 electron being attracted.  Less attraction should correspond to lower bond energy and longer bond distance in the H2+.