Who discovered radioactivity?

Henri Becquerel
Max Planck
Ernest Rutherford
Maria Skłodowska-Curie
Antoine Henri Becquerel (15 December 1852 – 25 August 1908) was a French physicist, Nobel laureate, and the first person to discover evidence of radioactivity. For work in this field he, along with Marie Skłodowska-Curie and Pierre Curie,[2] received the 1903 Nobel Prize in Physics. The SI unit for radioactivity, the becquerel (Bq), is named after him.
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Henri Becquerel
Max Planck
Ernest Rutherford
Maria Skłodowska-Curie
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