Q.

Which of the following is a radioactive element?

A. Cobalt
B. Uranium
C. Argon
D. Chromium
Answer» B. Uranium
Explanation: Uranium (U) is a naturally occurring radioactive element. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable arrangement. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear
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