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berkelium    
n. 放射性元素,符号Bk,原子序为98

放射性元素,符号Bk,原子序为98

berkelium
n 1: a radioactive transuranic element; discovered by bombarding
americium with helium [synonym: {berkelium}, {Bk}, {atomic
number 97}]

berkelium \ber*ke"li*um\ (b[~e]r*k[=e]"l[-e]*[u^]m), n. [from
the city of Berkeley, California, location of the University
of California campus where it was discovered.]
a chemical element of the transuranic series. Chemical symbol
Bk; atomic number 97; atomic weight 247. It is a radioactive
element, with no stable isotopes; the longest-lived isotope
is of mass number 247.07, decaying by alpha-emission with a
half-life of 1,400 years. The isotope with atomic weight 249
has a half-life of 314 days, and was isolated in weighable
quantities.

Syn: Bk.
[WordNet 1.5 PJC]


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  • Berkelium - Wikipedia
    Berkelium is a soft, silvery-white, radioactive actinide metal In the periodic table, it is located to the right of the actinide curium, to the left of the actinide californium and below the lanthanide terbium with which it shares many similarities in physical and chemical properties
  • Berkelium | Properties, Use, Facts | Britannica
    Berkelium, synthetic chemical element of the actinoid series of the periodic table, atomic number 97 All berkelium isotopes are radioactive, and the only use of berkelium has been in the synthesis of heavier elements such as tennessine The element berkelium was discovered in 1949
  • Berkelium - Element information, properties and uses | Periodic Table
    Element Berkelium (Bk), Group 20, Atomic Number 97, f-block, Mass [247] Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images
  • Berkelium Element Facts - Atomic Number 97 or Bk
    Berkelium Element Facts - Atomic Number 97 or Bk
  • Facts About Berkelium - Live Science
    Berkelium is the eighth member of the actinide transition series As a metal, it has a silvery appearance that rapidly oxidizes in air or oxygen at elevated temperatures, forming an oxide
  • Berkelium Facts – Element Bk Atomic Number 97 - Science Notes and . . .
    Berkelium primarily emits alpha particles, which are easily shielded but cause severe damage if internalized Its health risks are less than those of elements like plutonium or californium, as it produces lower gamma radiation and fission neutrons
  • Berkelium (Bk) Element: Discovery, Properties, Applications, Hazards
    Berkelium is a synthetic chemical element with an atomic number of 97 and is represented by the symbol ‘Bk’ in the periodic table It is silvery in appearance and belongs to the f-block of period 7 of the periodic table Berkelium was identified as the fifth synthetic trans-uranium element in the actinide series
  • Berkelium (Bk) – Definition, Preparation, Properties, Uses . . . - Examples
    Dive into the enigmatic world of Berkelium, a synthetic element that embodies the frontier of nuclear chemistry and atomic science Berkelium, with its profound significance in research and technology, illuminates the complexities of transuranic elements in the actinide series
  • Berkelium (Bk) - Periodic Table (Element Information More)
    Berkelium is a synthetic element which can only be prepared in a laboratory, and till now a very small amount of berkelium has been produced Berkelium has around 20 isotopes and all of them are radioactive in nature
  • Berkelium Element Facts
    Berkelium was the fifth synthetic transuranium element of the actinide series to be discovered It was first produced in 1949 by Stanley Thompson, Albert Ghiorso and Glenn Seaborg in California, USA The scientists bombarded 7 milligrams of americium-241 with alpha particles in the 60-inch cyclotron in Berkeley, California





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