99Es
Einsteinium
Actinide
Properties of Einsteinium
- Atomic number (Z)
- 99
- Symbol
- Es
- Name
- Einsteinium
- Atomic mass
- 252 u
- Period
- 7
- Group
- —
- Family
- Actinides (f-block)
- Classification
- Actinide
- Electron configuration
- [Rn] 5f¹¹ 7s²
About Einsteinium
Einsteinium is a chemical element with symbol Es and atomic number 99 (atomic mass of about 252 u). It is classified as a actinide on the periodic table.
On the periodic table, Einsteinium is located in period 7, outside the numbered groups (f-block), belonging to the actinides (f-block) family. An element's position reveals trends in its properties, such as atomic radius, electronegativity and metallic character.
The electron configuration of Einsteinium is [Rn] 5f¹¹ 7s², which determines how it forms chemical bonds and takes part in reactions.