Radioactivity was discovered by:

Q. Radioactivity was discovered by:
Answer: Henri Becquerel
Notes: Antoine Henri Becquerel, a French physicist, was the discoverer of radioactivity along with Marie Sklodowska-Curie and Pierre Curie, for which all three won the 1903 Nobel Prize in Physics. Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.

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