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It was discovered in 1945. It was found by Jacob A. Marinsky, Lawrence E. Glendenin, and Charles D. Coryell. It was discovered in Clinton Laboratories in Tennessee, United States.

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At room temperature, promethium is a solid. It freezes at 1,907F, or colder. Anything hotter will turn it into a liquid. When it reaches 5,432F, it will evaporate. It is a metal with an atomic mass of 145 u and its density is 6.475 g.cm-3.

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Promethium has not been tested to see if it flammable due to how rare it is. But other metals of the same type are very flammable in powder form. Promethium is a reactive element. It is known to react with the oxygen in the air, with water, and with both strong and weak acids.

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Promethium has 61 protons, 61 electrons, 7 valance electrons and its isotope range is from 126-166.

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If swallowed, promethium-147 passes through the digestive tract without being absorbed into the walls. Promethium is radioactive

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Promethium is man made and has no natural roles.Promethium can be produced by irradiating neodymium and praseodymium with neutrons.

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Small amounts of promethium are found in radios, atomic batteries, and guided missiles. The entered price of “Promethium” per 9 ounces is equal to 4.99.

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history: rsc.com
Physical Properties: lenntech.com
Chemical Properties: lenntech.com
Periodic Table Image: chemistrylearner.com

Atomic Structure: chemicalelements.com
Source: rsc.com
Safety: lenntech.com
Uses: lenntech.com