Promethium

This article is about the chemical element.

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• For the fictional metal from DC Comics, see the prometheum article.
• For the napalm-like fictional substance in the Warhammer 40,000 scenario, see Fictional_chemical_substance.

Promethium is a chemical element in the periodic table that has the symbol Pm and atomic number 61.

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Promethium has no stable isotopes. It is a man-made soft beta emitter; it does not emit gamma rays, but beta particles impinging on elements of high atomic numbers can generate X-rays. Pure promethium exists in two allotropic forms, but little else is known about the metal. Promethium salts luminesce in the dark with a pale blue or greenish glow due to their high radioactivity.

Promethium: Notable characteristics ►



 

Chemical element: A chemical element, often called simply element, is the class of atoms which contain the same number of protons....

Periodic table: The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements. First created by Dmitri Mendeleev, the elements are arranged by electron configuration so that many chemical properties follow a regular pattern across the tabl...

Atomic number: The atomic number (Z) is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. In an atom of neutral charge, the number of electrons typically equals the atomic number....