| 释义 |
Definition of fermium in English: fermiumnoun ˈfəːmɪəm mass nounThe chemical element of atomic number 100, a radioactive metal of the actinide series. Fermium does not occur naturally and was discovered in 1953 in the debris of the first hydrogen bomb explosion. Example sentencesExamples - Scientists have for the first time literally shed light on properties of the radioactive element fermium - a metal discovered some 50 years ago.
- The Dubna group had made fermium and rutherfordium this way in the 1970s.
- All isotopes of fermium are radioactive, with fermium-257 having the longest half life, 20.1 hours.
- The transfermium elements are those elements with atomic numbers greater than 100, the atomic number for fermium.
Origin 1950s: from the name of Fermi, Enrico + -ium. Definition of fermium in US English: fermiumnoun The chemical element of atomic number 100, a radioactive metal of the actinide series. Fermium does not occur naturally and was discovered in 1953 in the debris of the first hydrogen bomb explosion. Example sentencesExamples - All isotopes of fermium are radioactive, with fermium-257 having the longest half life, 20.1 hours.
- The Dubna group had made fermium and rutherfordium this way in the 1970s.
- The transfermium elements are those elements with atomic numbers greater than 100, the atomic number for fermium.
- Scientists have for the first time literally shed light on properties of the radioactive element fermium - a metal discovered some 50 years ago.
Origin 1950s: from the name of Fermi, Enrico + -ium. |