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No covalent bond formation due to repulsion

  1. Sep 12, 2018 #1
    Hi,
    I want to ask , is there any example in chemistry when during covalent bond formation the repulsive forces dominate and no bond is formed.
    Thanks
     
  2. jcsd
  3. Sep 12, 2018 #2

    TeethWhitener

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    Gold Member

    It's tough to know exactly what you mean. Plenty of diatomics have zero bond order (He2, for example), but I'm not sure I'd call the cause of that a "repulsive force." In fact, the helium dimer is weakly bound by dispersion forces. The closest thing I can think to what you're asking is a case like He22+, which is isoelectronic with H2, so it has a bond order of 1, but it is unstable because the two nuclei repel each other electrostatically.
     
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