| http://www.w3.org/ns/prov#value | - Examples of the metal with a valence of two or more include bivalent or more metals such as magnesium, aluminum, calcium, scandium, titanium, vanadium, manganese, iron, nickel, chromium, copper, zinc, gallium, germanium, strontium, yttrium, zirconium, molybdenum, indium, barium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, dysprosium, erbium, ytterbium, hafnium, tung
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