Beryllium and magnesium have a formal oxidation state of +2 in their compounds (see Oxidation Number); other oxidation states appear to exist only as transient reaction intermediates. Therefore, organometallic compounds of general formula R2M and RMY may exist, in addition to the nonorganometallic MY - http://www.science-chemistry.com/beryllium-and-magnesium-bonding-and-structure
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