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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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