Q.

Which of the following elements is non- radioactive?

A. Uranium
B. Thorium
C. Plutonium
D. Zirconium
Answer» D. Zirconium
Explanation: Zirconium is non-radioactive. It is a chemical element with the symbol Zr, atomic number 40 and atomic mass of 91.224. The name of zirconium is taken from the mineral zircon, the most important source of zirconium. It is a lustrous, grey-white, strong transition metal that resembles titanium.
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