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    Hey guys,

    I'm putting together some basic Lewis structures/dot-and-cross diagrams to revise from, and I wanted to throw in some basic examples of dative covalent bonds (/co-ordinate bonds). I've got things like the ammonium ion and carbon monoxide, but I don't know if there are any examples of diatomic molecules joined by just a single covalent bond (so hypothetically, a noble gas and a hydrogen nucleus in a similar way to NH4+). CO is fine, but kinda awkward at a glance to realise there are two standard covalent bonds and one dative. Are there any examples of these?
 
 
 
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