Mercury Hg2+2 Ion: Why Does It Form?

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SUMMARY

Mercury forms the diatomic ion Hg2+2 due to its unique electronic configuration and the presence of sp hybrid orbitals in the Hg+ atom, allowing it to bond with another Hg+ ion. This behavior is distinct from zinc and cadmium, which only form monatomic ions Zn+2 and Cd+2, respectively. The discussion also references copper(I) ions and their potential for similar bonding, as well as organometallic compounds like Mn2(CO)10 that exhibit Mn-Mn bonding for stability.

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Mercury can form Hg2+2 and Hg+2 ions. Why does mercury form Hg2+2? Are there any other "diatomic ions" like this? I assume this has to do with atomic size, but why don't zinc and cadmium behave like this? They only form Zn+2 and Cd+2.
 
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Hg+ atom has sp hybrid orbital, so it likes to bond with additional Hg+ ion to form a Hg22+ ion. Copper(I) ions are said to form such bonding, but I am not sure about this. Also some atoms in which organometallic bonding principles are present (like Mn2(CO)10) has Mn-Mn bonding to reach a stable noble gas configuration.
 
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