nobelium वाक्य
उदाहरण वाक्य
मोबाइल
- Such elements include lawrencium, rutherfordium, seaborgium, bohrium, and roentgenium, but not mendelevium, nobelium, or copernicium.
- All elements up to and including nobelium, except technetium and promethium, are known to have at least one beta-stable isotope.
- Once the nobelium-255 is produced, it can be separated out in a similar way as used to purify the neighboring actinide mendelevium.
- Using a long capillary tube, and including potassium chloride aerosols in the helium gas, the nobelium atoms can be transported over tens of meters.
- For example, seaborgium 265, which has a nucleus containing 106 protons and 159 neutrons, decays to rutherfordium 261, which decays to nobelium 257.
- In the 1950s and 1960s, many claims of the discovery of nobelium were made from laboratories in Sweden, the Soviet Union, and the United States.
- The even-odd nobelium isotopes mostly continue to have longer half-lives as their mass numbers increase, with a dip in the trend at 257 No.
- However, both NoCl 2 and NoCl 3 were expected to exhibit nonvolatile behavior and hence this experiment was inconclusive as to what the preferred oxidation state of nobelium was.
- They were plutonium, americium ( used today in smoke detectors ), curium ( used in medicine ), berkelium, californium, einsteinium, fermium, mendelevium and nobelium.
- The chemical properties of nobelium and lawrencium were studied with 255 No ( t 1 / 2 = 3 min ) and 256 Lr ( t 1 / 2 = 35 s ).
- The activity was initially assigned to 254 No but later changed to 252 No . However, they also noted that it was not certain that nobelium had been produced due to difficult conditions.
- Similarly, nobelium was produced at the Joint Institute for Nuclear Research, Dubna, Russia, in 1965 in several reactions, one of which included irradiation of 243 Am with 15 N ions.
- Among these exotics is mendelevium, after Dmitry I . Mendeleyev, the 19th-century Russian chemist who invented the periodic table, and nobelium, for the bestower of science's big prize.
- In addition to plutonium, he is credited as a lead discoverer of americium, curium, and berkelium, and as a co-discoverer of californium, einsteinium, fermium, mendelevium, nobelium and seaborgium.
- Elements discovered by Berkeley Lab physicists include astatine, neptunium, plutonium, curium, americium, berkelium *, californium *, einsteinium, fermium, mendelevium, nobelium, lawrencium *, dubnium, and seaborgium *.
- The American synthesis was independently confirmed in 1973 and secured the identification of rutherfordium as the parent by the observation of K-alpha X-rays in the elemental signature of the 257 Rf decay product, nobelium-253.
- However, if a direct " catcher " gold foil is used, the process is complicated by the need to separate out the gold using anion-exchange chromatography before isolating the nobelium by elution from chromatographic extraction columns using HDEHP.
- Among the transuranium elements, this restriction was relaxed, there followed curium ( after the Curies ), einsteinium, fermium ( Enrico Fermi ), mendelevium ( Dmitri Mendeleev ), nobelium, and lawrencium ( after Ernest Lawrence ).
- ""'The Elements "'" is a song by musical humorist and lecturer Tom Lehrer, which recites the names of all the chemical elements known at the time of writing, up to number 102, nobelium.
- In 1986, nobelium metal was estimated to have an enthalpy of sublimation between 126 kJ�mol " 1, a value close to the values for einsteinium, fermium, and mendelevium and supporting the theory that nobelium would form a divalent metal.
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