Rf, or Rutherfordium, is a synthetic element with the atomic number 104. It was first discovered in 1964 by a team of Russian scientists at the Joint Institute for Nuclear Research in Dubna. Rf is classified as a transition metal and is part of the d-block of the periodic table. Due to its short half-life, it is not found naturally and must be created in a laboratory. The element is named after Ernest Rutherford, a pioneer in nuclear physics. Rf is highly radioactive and has no significant commercial applications. Its most stable isotope, Rf-267, has a half-life of about 1.3 hours, making it challenging to study and understand its properties.