99
Es
Einsteinium
(252)
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#99
Einsteinium
actinide· Solid·252 u
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.
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Identity
- Symbol
- Es
- Atomic Number
- 99
- Atomic Mass
- 252 u
- Category
- actinide
- Block
- f-block
- Period
- 7
- Group
- 3
- Appearance
- silver-colored
- Year Discovered
- 1952 CE
- Discovered By
- Lawrence Berkeley National Laboratory
- Named By
- Albert Einstein
Electrons
- Configuration
- [Rn] 5f11 7s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f11
- Shells
- 2, 8, 18, 32, 29, 8, 2
- Electronegativity
- 1.3
- Electron Affinity
- -28.6
- Oxidation States
- +3
- Ionization Energies
- 619
Physical Properties
- State at
- Solid
- Melting Point
- 1133
- Boiling Point
- 1269
- Density
- 8.84
- Crystal Structure
- FCC
- Magnetic Ordering
- n/a
Mechanical
Thermal & Electrical
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 0
- Ocean
- 0
- Human Body
- 0