Einsteinium

Metal

synthetic

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

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Physical data

Electronic 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: --

Thermal data

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

Steric data

Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: -- cm³/mol
Density (293 K): -- g/cm³
Crystal structure: --

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Isotopes

Nuclide	Mass	Spin	Halflife	Decay mode	Decay tree
²⁴⁶Es	246.073	0	7.7m	EC, α	View
²⁴⁸Es	248	0	26m	EC, α	View
²⁴⁹Es	249	7/2	1.70h	EC, α	View
²⁵⁰Es	250	6	8.6h	EC	View
²⁵¹Es	251	3/2	1.38d	EC, α	View
²⁵²Es	252.083	0	1.29y	α, EC	View
²⁵³Es	253.085	7/2	20.47d	α, SF	View
²⁵⁴Es	254.088	7/2	276d	α	View
²⁵⁴Esm	254	2	1.64d	β-, α	View
²⁵⁵Es	255	7/2	40d	β-, α	View

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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.

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