Not only in a chemical sense is elemental gold the paragon of precious. This view needs to be somewhat reassessed; elemental gold disproportionates in the presence of the alkali metals rubidium or cesium and their corresponding oxides. The auride aurates M7Au5O2 (M=Rb, Cs) obtained by this reaction can be interpreted as intergrowths of MAu and M3AuO2. Thus, another amazing parallel becomes obvious between the chemistry of gold and the halogens.
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Mudring et al. (2000) studied this question.
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