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Technical data for Einsteinium

Click any property name to see plots of that property for all the elements.

Overview
NameEinsteinium
SymbolEs
Atomic Number99
Atomic Weight252[note]
DensityN/A
Melting Point860 °C
Boiling PointN/A

Thermal properties
PhaseSolid
Melting Point860 °C
Boiling PointN/A
Absolute Melting Point1133 K
Absolute Boiling PointN/A
Critical PressureN/A
Critical TemperatureN/A
Heat of FusionN/A
Heat of VaporizationN/A
Heat of CombustionN/A
Specific HeatN/A
Adiabatic IndexN/A
Neel PointN/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Bulk physical properties
DensityN/A
Density (Liquid)N/A
Molar VolumeN/A
Brinell HardnessN/A
Mohs HardnessN/A
Vickers HardnessN/A
Bulk ModulusN/A
Shear ModulusN/A
Young ModulusN/A
Poisson RatioN/A
Refractive IndexN/A
Speed of SoundN/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Reactivity
Valence4
Electronegativity1.3
ElectronAffinityN/A
Ionization Energies
619 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard ClassN/A
DOT NumbersN/A
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockf
GroupN/A
Period7
Electron Configuration[Rn]5f117s2
ColorN/A
Discovery
1952 in United States
Gas phaseN/A
CAS NumberCAS7429-92-7
CID NumberN/A
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeN/A
Electrical ConductivityN/A
ResistivityN/A
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Curie PointN/A
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in UniverseN/A
% in SunNone
% in MeteoritesNone
% in Earth's CrustNone
% in OceansNone
% in HumansNone

Atomic dimensions and structure
Atomic RadiusN/A
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureN/A
Lattice AnglesN/A
Lattice ConstantsN/A
Space Group NameN/A
Space Group NumberN/A

Nuclear Properties
Half-Life1.2922 y
Lifetime1.865 y
Decay ModeAlphaEmission
Quantum Numbers5I15/2
Neutron Cross Section160
Neutron Mass AbsorptionN/A
Known Isotopes
240Es, 241Es, 242Es, 243Es, 244Es, 245Es, 246Es, 247Es, 248Es, 249Es, 250Es, 251Es, 252Es, 253Es, 254Es, 255Es, 256Es, 257Es, 258Es
Stable Isotopes
Isotopic Abundances


Notes on the properties of Einsteinium:

Atomic Weight: Atomic mass number given for longest lived isotope.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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