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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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