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What is the SI unit for radioactivity and who is it named after?
What is Henri Becquerel known for?
What did Becquerel conclude from his experiments with the phosphorescent substance?
Who observed that uranium salts emitted radiation that could darken photographic emulsions?
Who was Henri Becquerel?
What did Becquerel observe when different radioactive substances were put in a magnetic field?
What other radioactive elements were discovered by Marie Skłodowska-Curie and Pierre Curie?
What did Henri Becquerel discover?