Periodic table / Fermium

Overview

Fermium is a synthetic element with symbol Fm and atomic number 100. It is a member of the actinide series. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities, although pure fermium metal has not yet been prepared.

Electron configuration

The electron configuration of Fermium is [Rn] 5f12 7s2, with electron shells of 2, 8, 18, 32, 30, 8, 2.

Physical and chemical properties

Fermium is classified as a actinide. It has an atomic mass of 257 and exists as a solid at standard conditions.

Real-world uses of Fermium

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

Interesting facts about Fermium

• Fermium has the atomic number 100 and chemical symbol Fm.
• It belongs to period 7, group 3 of the periodic table.
• Fermium was discovered by Lawrence Berkeley National Laboratory.

Explore Fermium interactively

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