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Q. Which of the following elements does not exhibit natural radioactivity?
Answer: Aluminium
Notes: Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occurring isotope. Aluminium is a silvery white, soft, ductile metal with stable nucleus in its atoms. 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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📌 Question Number: 42 in Chemistry-8-Radioactivity in the above course in App.