99Solid
Es 252 Atomic mass · uActinides
Einsteinium
Einsteinium is a synthetic element with symbol Es and atomic number 99. It is the seventh transuranic element, and an actinide. Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952, and named after Albert Einstein.
Discovery 1952 (Lawrence Berkeley National Laboratory)
K2L8M18N32O29P8Q2
Physical properties
Values for the element in its standard state.
- Density
- Not available
- Melting point
- 1,133K
- Boiling point
- Not available
- Atomic radius
- Not available
- Bonding type
- Not recorded
- Molar heat
- Not available
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 6 electrons; 5f, 11 electrons; 7s, 2 electrons;
[Rn] represents 86 core electrons. The full view shows them explicitly.
99 electrons Orbital order preserved from source
- Electronegativity
- 1.3Pauling scale
- First ionization energy
- 619kJ/mol
- Electron affinity
- Not available
- Van der Waals radius
- Not available
Es EinsteiniumAtomic number 99
619kJ/mol
Atomic numberGaps indicate unavailable data
About einsteinium
- Appearance
- Silver-colored
- Discovery
- 1952 (Lawrence Berkeley National Laboratory)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.