Separation of the isotopes of uranium requires a physical, rather than chemical, method because: A)mixing other chemicals with uranium is too dangerous B)the isotopes are chemically the same C)the isotopes have exactly the same number of neutrons per nucleus D)natural uranium contains only 0.7% ²³⁵U E)uranium is the heaviest element in nature

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Isotopes of an element, including uranium, have the same number of protons (and thus are chemically identical) but differ in the number of neutrons. This makes their chemical properties virtually identical, necessitating physical methods for their separation.

Separation of the Isotopes of Uranium Requires a Physical, Rather