Matches in DBpedia 2016-04 for { ?s ?p "Both metals exhibit an extensive chemistry, principally in the +3 oxidation state, with +1 also being important, and a significant chemistry of +4 iridium existing. Few compounds are known in the +2 state, in contrast to the situation for cobalt, their lighter homologue ."" }
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- books?vid=ISBN0-7514-0413-6 quote "Both metals exhibit an extensive chemistry, principally in the +3 oxidation state, with +1 also being important, and a significant chemistry of +4 iridium existing. Few compounds are known in the +2 state, in contrast to the situation for cobalt, their lighter homologue ."".