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Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford.
As of January 1995 it was thought that eleven isotopes of Element 104 had been identified. The Berkeley group proposed for the new element the name Rutherfordium (symbol Rf), in honor of Ernest Rutherford, New Zealand physicist who is known as the father of nuclear physics. Ernest Rutherford