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Einsteinium (Es)
Element with atomic number 99, category: Actinide, a solid at room temperature.
Element 99 of 118
Actinide
Einsteinium
Group 13, Period 7 (actinide series)
Common Uses
Research
Electron Diagram
About Einsteinium
Einsteinium is a chemical element with the symbol Es and atomic number 99, meaning every atom has 99 protons in its nucleus. It is classed as Actinide and is a solid at room temperature. Its atomic mass is about 252 atomic mass units (u).
On the periodic table, Einsteinium sits in group 13, period 7 (actinide series), which determines how many electron shells it has and how it tends to react with other elements.
Uses of Einsteinium
In daily life and industry, Einsteinium is used for Research. These uses are closely tied to the typical properties of elements in the Actinide category.
Electron Structure of Einsteinium
Using a simplified electron shell model (at most 2 electrons in the first shell, 8 in the second, 18 in the third, and so on), Einsteinium has 6 electron shells, with an approximate arrangement of 2, 8, 18, 32, 32, 7 electrons from the innermost shell to the outermost. This is a simplified learning model, not the full electron configuration that accounts for the s, p, d and f subshells.
Explore Other Elements
Want to see another element or try the element symbol quiz? Go back to the Interactive Periodic Table to explore all 118 chemical elements.