| http://www.w3.org/ns/prov#value | - For heavy elements such as uranium, achieving a suitable separation factor involves contact between two valence (oxidation state) forms such as hexavalent [U 6+ as in uranyl chloride (UO 2 Cl 2 )] and the quadrivalent [U 4+ as in uranium tetrachloride (UCl 4 )].
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