Periodic table / Promethium

Overview

Promethium, originally prometheum, is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements.

Electron configuration

The electron configuration of Promethium is [Xe] 4f5 6s2, with electron shells of 2, 8, 18, 23, 8, 2.

Physical and chemical properties

Promethium is classified as a lanthanide. It has an atomic mass of 145 and exists as a solid at standard conditions, appearing as metallic.

Real-world uses of Promethium

Promethium, a lanthanide, is used in magnets, electronics, lighting, and other specialized high-tech applications.

Interesting facts about Promethium

• Promethium has the atomic number 61 and chemical symbol Pm.
• It belongs to period 6, group 3 of the periodic table.
• Promethium was discovered by Chien Shiung Wu.

Explore Promethium interactively

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