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{{Compound|name=Platinum|chemf=Pt|density=21.45|group=Platinum Group Metals|num=78|stp_p=solid|stp_q=silvery|mm=195|mp=1769|bp=4825|cote=8|nfpa_h=1|nfp ...atinum is classed as a ''noble metal'' because it is extremely unreactive. Platinum also has a very high melting point. This and its nonreactive nature make it

{{Compound|name=Silver|chemf=Ag|density=10.49|group=Transition Metals|num=47|stp_p=solid|stp_q=silver|mm=107.9|mp=961.8|bp=2162|cote=19.7|nfpa_h= ...ty. Along with [[gold]] and [[platinum]] it is considered one of the noble metals.

| group=Transition Metals ...ctions such as the oxidation of ammonia. It has activity on the order of [[platinum]] but is more abundant and easier to react.

...ric Acid|chemf=HNO3|density=1.51|mp=-42|bp=83|pKal=-1.4|nfpa_h=3|nfpa_o=OX|group=Mineral Acids|industrial=yes|mm=63.01|stp_p=liquid|stp_q=clear, oily|sol_aq * Action on metals

...4|stp_p=liquid|stp_q=oily|mm=98.79|density=1.84|mp=10|bp=337|pKal=−3, 1.99|group=Mineral Acids|nfpa_h=3|nfpa_r=2|nfpa_o=<s>W</s>|industrial=yes|sol_aq=misc| * Sulfuric acid will dissolve most metals and virtually all organic matter. Spills of concentrated acid are often ess