prov:value
| - Compounds containing at least one element with an atomic number which is selected from the group formed by the following numbers: 3, 11, 12, 19 to 33, 37 to 51, 55 to 83, 87 to 103, include oxides, hydroxides, oxyhydroxides, acids, polyoxometallates, alkoxides with formula M(OR1)x where R1 is an alkyl radical and x is generally in the range 2 to 6, oxalates, ammonium salts, nitrates, carbonates, h
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