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Einsteinium

Metal radioactivesynthetic
Symbol: Es
Atomic number: 99
Atomic mass: (252.0830)
Group: Actinide
CAS-number: 7429-92-7

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 29, 8, 2
Orbitals: [Rn] 5f11 7s2
Electronegativity: --, 1.2
1. Ionization potential: 6.42 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 3
Electrical conductivity: --
Melting point: -- °C
Boiling point: -- °C
Specific heat: -- J/gK
Heat of fusion: -- kJ/mol
Heat of vaporization: -- kJ/mol
Thermal conductivity: 0.1 W/cmK
Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: -- cm³/mol
Density (293 K): -- g/cm³
Crystal structure: --

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
246Es 0 246.073 0 7.7m EC, α View
248Es 0 248 0 26m EC, α View
249Es 0 249 7/2 1.70h EC, α View
250Es 0 250 6 8.6h EC View
251Es 0 251 3/2 1.38d EC, α View
252Es 0 252.083 0 1.29y α, EC View
253Es 0 253.085 7/2 20.47d α, SF View
254Es 0 254.088 7/2 276d α View
254Esm 0 254 2 1.64d β-, α View
255Es 0 255 7/2 40d β-, α View

Other info

Name origin:Named in honor of the scientist Albert Einstein.
Description:Synthetic radioactive metal.
Discovered by:Argonne, Los Alamos, University of California
Year:1952
Place:United States
Sources:Made by bombarding uranium with neutrons.
Use(s):It has no significant commercial applications.