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The Element Promethium


"The Atom"

Definition of the Promethium Element

A radioactive metallic element of the rare-earth group obtained as a fission product of uranium or from neutron-irradiated neodymium. Promethium is not stable so it undergoes radioactive decay. The Atomic Number of this element is 61 and the Element Symbol is Pm.

The Properties of the Promethium Element
Symbol: Pm
Atomic Number: 61
Atomic Mass: (145.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 61
Number of Neutrons: 84
Crystal Structure: Hexagonal
Density @ 293 K: 6.475 g/cm3
Color: Unknown

Origin / Meaning of the name Promethium
The name originates from Prometheus from Greek mythology, who stole the fire of the sky and gave it to mankind.

The Discovery of Promethium
Promethium was discovered by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell in 1946

Periodic Table Group and Classification of the of the Promethium Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Promethium is classified as an element in the Lanthanide series as one of the "Rare Earth Elements" which can located in Group 3 elements of the Periodic Table and in the 6th and 7th periods. The Rare Earth Elements are divided into the Lanthanide and Actinide series. The elements in the Lanthanide series closely resemble lanthanum, and one another, in their chemical and physical properties. Their compounds are used as catalysts in the production of petroleum and synthetic products. Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals.

Facts about the History of the Discovery of Promethium Element
Properties within each individual group are similar, but nevertheless vary within a group. Generally chemical activity decreases as the period increases a non-metal group and increases as the period increases within a metal group. The first element in a group is always an active metal, the last is always an inactive non-metal.

Occurrence of the Promethium Element
Promethium does not naturally occur on earth
Identified in the spectrum of the star HR465 in Andromeda.

Abundances of the element in different environments
% in Universe N/A
% in Sun None
% in Meteorites None
% in Earth's Crust None
% in Oceans None
% in Humans None

Associated Uses of Promethium
Nuclear batteries
Light sources

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