Mercury Hg2+2 ion

Cesium

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.

chem_tr

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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Cesium	Mercury Hg2+2 ion 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.

chem_tr Recognitions: Gold Member Science Advisor	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.