Gourt > Science > Chemistry > Elements > Einsteinium
Einsteinium is a synthetic element in the periodic table that has the symbol Es and atomic number 99. A metallic highly radioactive transuranic element (7th in the series) in the actinides, einsteinium is produced by bombarding plutonium with neutrons and was discovered in the debris of the first hydrogen bomb test. It was named after Albert Einstein and has no known uses. Tracer studies using the isotope 253Es show that einsteinium has chemical properties typical of a heavy trivalent, actinide element. Einsteinium has 99 protons, 99 electrons and 153 neutrons.
History
Einsteinium was first identified in December 1952 by Albert Ghiorso at the University of California, Berkeley and another team headed by G.R. Choppin at Los Alamos National Laboratory. Both were examining debris from the first hydrogen bomb test of November, 1952 (see Operation Ivy). They discovered the isotope 253Es (half-life 20.5 days) that was made by the nuclear fusion of 15 neutrons with 238U (which then went through seven beta decays). These findings were kept secret until 1955 due to Cold War tensions, however.
In 1961, enough einsteinium was synthesized to prepare a macroscopic amount of 253Es. This sample weighed about 0.01 mg and was measured using a special balance. The material produced was used to produce mendelevium. Further einsteinium has been produced at the Oak Ridge National Laboratory's High Flux Isotope Reactor in Tennessee by bombarding 239Pu with neutrons. Around 3 mg was created over a four year program of irradiation and then chemical separation from a starting 1 kg of plutonium isotope.
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@TheWhaler I thought it was stupid, too, but then I remembered stuff like Einsteinium, Californium, and that spider they named after Colbert
llew_stevens (Llewellyn Stevens) Mon, 04 Jan 2010 21:15:14 -0000
@TheWhaler I thought it was stupid, too, but then I remembered stuff like Einsteinium, Californium, and that spider they named after Colbert
@lidewij Calcium, Chromium, Curium. Sulphur, Californium, Fermium, Berkelium, Mendelevium, Einsteinium, Nobelium, Argon, Krypton, Neon
TheMadVender (Tom) Thu, 31 Dec 2009 21:50:19 -0000
@lidewij Calcium, Chromium, Curium. Sulphur, Californium, Fermium, Berkelium, Mendelevium, Einsteinium, Nobelium, Argon, Krypton, Neon
Cadmium Calcium Chromium Curium Sulphur Californium Fermium Berkelium Mendelevium Einsteinium Nobelium Argon Krypton Neon Radon Xenon...
The_El_Machine (Eliot) Thu, 31 Dec 2009 13:49:22 -0000
Cadmium Calcium Chromium Curium Sulphur Californium Fermium Berkelium Mendelevium Einsteinium Nobelium Argon Krypton Neon Radon Xenon...
Carbon Lithium Vanadium Einsteinium Nickle Iodine Cerium. What does this series mean?
C4Clive (Clive P. Davidson) Tue, 29 Dec 2009 20:51:12 -0000
Carbon Lithium Vanadium Einsteinium Nickle Iodine Cerium. What does this series mean?
It annoys me that people complain about the name "Unobtanium" in Avatar. IRL, there's an element called EINSTEINIUM! Nobelium! Californium!
bradofarrell (BradOFarrell) Tue, 29 Dec 2009 10:26:10 -0000
It annoys me that people complain about the name "Unobtanium" in Avatar. IRL, there's an element called EINSTEINIUM! Nobelium! Californium!
ChemGlobe: Einsteinium - Electronic data along with an isotope table and basic facts.
Meta Description: [ The chemical element [Es] - Einsteinium - Datasheet ]
ChemicalElements.com: Einsteinium - Basic information, atomic structure, and table of isotopes.
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Einsteinium - Data tables and historic information.
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EnvironmentalChemistry.com: Einsteinium - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Einsteinium - Basic physical and historical information.
Meta Description: [ The Element Einsteinium - Basic Physical and Historical Information ]
LANL: Einsteinium - Basic information, history, and isotopes.
Lenntech: Einsteinium - Physical data and chemical properties.
Meta Description: [ chemical properties, health and environmental effects of einsteinium ]
Visual Elements: Einsteinium - Discovery, general and physical information, and ionisation energies.
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WebElements: Einsteinium - Extensive information on history, compounds, and properties.
Meta Description: [ This WebElements periodic table page contains key information for the element einsteinium ]
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