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Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford.
In 1896 Henri Becquerel discovered a new phenomenon that Curie would soon name radioactivity, and together with Pierre she discovered two new elements, polonium and radium, in 1898. For their discovery of radioactivity, the three won the 1903 Nobel Prize for physics.