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Which one is man made element

A. Plutonium
B. U-235
C. Thorium
D. Radium

Answer & Solution
Option: A
Explanation :a synthetic element is a chemical element that does not occur naturally on Earth, and can only be created artificially. So far, 24 synthetic elements have been created (those with atomic numbers 95–118).
Seven other elements were first created artificially and thus considered synthetic, but later discovered to exist naturally as well; among them plutonium—first synthesized in 1940
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