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Einsteinium (Es) - Properties


Atomic mass, symbol and atomic number

Einsteinium is an artificially created element with the element symbol Es and atomic number 99. In the periodic table it belongs to the actinoids with an atomic mass of 252 u. The chemical element discovered in 1952 is radioactive and is in a solid state of aggregation at room temperature.

Wanted poster: Einsteinium (English Einsteinium)

General
Chemical element:Einsteinium
Symbol:It
Atomic number:99
Group:actinides
Period:7
Block:f-block
Series:actinides
Appearance:Gray
explorers:Lawrence Berkeley National Laboratory
Year of discovery:1952
Atomic properties
Atomic mass:252 u
Atomic radius:203 pm
Covalent radius:unknown
Van der Waals radius:unknown
Electron configuration:Rn 5f11 7s2
ionization:613.84 kJ / mol
Physical Properties
Physical state:firmly
Density:8.84 g / cm3
Crystal structure:cubic
Magnetism:paramagnetic
molar volume:unknown
Mohs hardness:unknown
Melting point:860 ° C
Boiling point:996 ° C
Heat of fusion:unknown
Heat of vaporization:unknown
Thermal conductivity:unknown
Chemical properties
electronegativity:1,3

Did you know that ...

  • Einsteinium could be detected for the first time after the explosion of a hydrogen bomb?
  • the shortest-lived isotope of Einsteinium (249It) has a half-life of only 1.5 min?
  • Einsteinium was named after the physicist Albert Einstein, who himself is not the discoverer of the chemical element?