ruth·er·for·di·um (r    r-fr d -m)n. Symbol Rf A radioactive synthetic element whose longest-lived isotopes haved mass numbers of 253, 255, 257, and 259 with half-lives of 1.8, 1.6, 4.7, and 3.4 seconds. Atomic number 104. |
rutherfordium (Rf)
Etymology: Sir Ernest Rutherford, British physicist, 1871-1937
a synthetic transuranic element. Its atomic number is 104, and its atomic mass is 261.
rutherfordium
a chemical element, atomic number 104, atomic weight 261, symbol Rf. See Table 6.
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