Einsteinium - 99Es: the essentials
- Name: einsteinium
- Symbol: Es
- Atomic number: 99
- Relative atomic mass (Ar): [ 252 ] (longest lived isotope)
- Standard state: solid at 298 K
- Appearance: unknown, but probably metallic and silvery white or grey in appearance
- Classification: Metallic
- Group in periodic table:
- Group name: Actinoid
- Period in periodic table: 7 (actinoid)
- Block in periodic table: f
- Shell structure: 2.8.18.32.29.8.2
- CAS Registry: 7429-92-7
Einsteinium atoms have 99 electrons and the shell structure is 2.8.18.32.29.8.2. The ground state electronic configuration of neutral einsteinium is [Rn].5f11.7s2 and the term symbol of einsteinium is 5I15/2.
Einsteinium: description
Einsteinium is radioactive rare earth metal named after Albert Einstein. It is of no commercial importance and only a few of its compounds are known.
Einsteinium: physical properties
Density of solid: 13500 kg m-3
Molar volume: 28.52 (seems high?) cm3
Thermal conductivity: 10 (estimate) W m‑1 K‑1
Einsteinium: heat properties
Melting point: 1133 [860 °C (1580 °F)] K
Boiling point: (no data) K
Enthalpy of fusion: 20.5 kJ mol-1
Einsteinium: atom sizes
Atomic radius (empirical): (no data) pm
Molecular single bond covalent radius: 165 (coordination number 3) ppm
van der Waals radius: (no data) ppm
Einsteinium: electronegativities
Pauling electronegativity: 1.3 (Pauling units)
Allred Rochow electronegativity: 1.2 (Pauling units)
Mulliken-Jaffe electronegativity: (no data)
Einsteinium: orbital properties
First ionisation energy: 614.38 kJ mol‑1
Second ionisation energy: 1180 kJ mol‑1
Third ionisation energy: 2190 kJ mol‑1
Einsteinium: abundances
Universe: (no data) ppb by weight
Crustal rocks: (no data) ppb by weight
Human: (no data) ppb by weight
Einsteinium: crystal structure
Einsteinium: biological data
- Human abundance by weight: (no data) ppb by weight
Einsteinium has no biological role.
Einsteinium: uses
Einsteinium: reactions
Reactions of einsteinium as the element with air, water, halogens, acids, and bases where known.
Einsteinium: binary compounds
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of einsteinium where known.
Einsteinium: compound properties
Bond strengths; lattice energies of einsteinium halides, hydrides, oxides (where known); and reduction potentials where known.
Einsteinium: history
Einsteinium was discovered by Workers at Argonne, Los Alamos, USA, and the University of California at Berkeley, USA. in 1952 at USA. Origin of name: named after "Albert Einstein".Einsteinium: isotopes
Einsteinium: isolation
Isolation: coming soon!