99
Es
Einsteinium
Einsteinium
Einsteinium (Es)
Actinides · Solid · Period 7 · Group 3
Element Properties
- Atomic Number
- 99
- Symbol
- Es
- Atomic Mass
- 252.083
- Category
- Actinides
- Standard State
- Solid
- Period
- 7
- Group
- 3
- Electronegativity
- 1.3
- Atomic Radius
- 245
- Ionization Energy
- 6.42
- Electron Affinity
- —
- Oxidation States
- +3
- Melting Point
- 1133 K (859.85 °C)
- Boiling Point
- —
- Density
- —
- Electron Configuration
- [Rn]7s2 5f11
- Year Discovered
- 1952
Electron shells
[Rn]7s2 5f11
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Einsteinium?
The atomic number of Einsteinium is 99, which equals the number of protons in its nucleus.
What is the atomic mass of Einsteinium?
The atomic mass of Einsteinium is approximately 252.083 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Einsteinium?
The electron configuration of Einsteinium is [Rn]7s2 5f11.
Where is Einsteinium in the periodic table?
Einsteinium is located in period 7, group 3.
When was Einsteinium discovered?
Einsteinium was discovered in 1952.
Related elements
Same group
21
Sc
Scandium
44.956
39
Y
Yttrium
88.906
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.24