Periodic table / Einsteinium

Overview

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.

Electron configuration

The electron configuration of Einsteinium is [Rn] 5f11 7s2, with electron shells of 2, 8, 18, 32, 29, 8, 2.

Physical and chemical properties

Einsteinium is classified as a actinide. It has an atomic mass of 252 and exists as a solid at standard conditions, appearing as silver-colored.

Real-world uses of Einsteinium

Einsteinium is an actinide studied primarily in nuclear science and research due to its radioactive properties.

Interesting facts about Einsteinium

• Einsteinium has the atomic number 99 and chemical symbol Es.
• It belongs to period 7, group 3 of the periodic table.
• Einsteinium was discovered by Lawrence Berkeley National Laboratory.

Explore Einsteinium interactively

Want to compare Einsteinium with other elements or see it highlighted on the full table? Open the interactive periodic table and click on Es to explore properties, trends, and neighboring elements. You can also test your knowledge with our periodic table quiz game.