The magnetic susceptibilities of U(SO4)2·3.26H2O, U(C2O4)2·5H2O and U(C5H7O2)4have been determined at a series of temperatures from the boiling point of liquid N2to 60°C. The Weiss‐Curie law is obeyed at temperatures above 195°K. The data indicate the presence of two 5felectrons in the ground state. The susceptibility of Th(C5H7O2)4at room temperature has also been determined.
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