An element that does not occur in nature but can be produced artificially is__________?
Correct answer: A. Plutonium
- A. Plutonium
- B. Uranium
- C. Radium
- D. Thorium
Explanation
Plutonium is chiefly produced artificially by neutron irradiation of uranium in nuclear reactors. Uranium, thorium and radium occur naturally, although radium is present only in very small amounts.
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