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Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford.
While conducting research at Cambridge University, James Chadwick worked with Ernest Rutherford. Rutherford engrained his name in history when he discovered the proton. With more research, he â as well as other researchers â determined that it was not the only particle that made up the nucleus. Rutherford hired Chadwick in 1921, where he focused his research on radioactivity.