In my textbook it is mentioned that maximum 3 covalent bonds can be formed within 2 atoms, which makes sense as 1 p orbital from each can be used for sigma bond and the remaining 2 can form pi bonds. But d subshell contains 5 d-orbitals, so why is it not possible to form 5 bonds?

I tried searching for it but couldn't find it anywhere

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    $\begingroup$ W2 and Mo2 form sextuple (6) bonds. en.wikipedia.org/wiki/Sextuple_bond $\endgroup$
    – Poutnik
    Sep 28, 2021 at 5:33
  • $\begingroup$ But anything more than 3 is rare. $\endgroup$
    – Poutnik
    Sep 28, 2021 at 6:22
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    $\begingroup$ Perhaps more importantly, anything more than 3 is impossible for carbon. $\endgroup$ Sep 28, 2021 at 6:58
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    $\begingroup$ Unfortunately this question hinges on the definition of bond. And the whole concept of a bond is still very much debated and not clear at all. There's no point in going down this rabbit hole before some decent understanding of quantum mechanics. The carbon dimer is actually a nice point in case for this ongoing debate; I think we have a question for that. $\endgroup$ Sep 28, 2021 at 19:28