Mercury Hg2+2 ion

  1. 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.
    Last edited: Mar 15, 2005
  2. jcsd
  3. chem_tr

    chem_tr 613
    Science Advisor
    Gold Member

    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.
    Last edited: Mar 16, 2005
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