Q.

Which of the following elements does not exhibit natural radioactivity?

A. Uranium
B. Thorium
C. Aluminium
D. Polonium
Answer» C. Aluminium
Explanation: Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust.
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