Prometthium: The Periodic Table

Promethium, Pm, is the 61st element on the Periodic Table. It was discovered in 1945 by Jacob A. Marinsky. It’s a metal, and named after the Greek God Prometheus. It is not naturally occurring, but can survive outside of a lab.

Promethium has an atomic number of 61, which is the number of protons. Its atomic mass, protons+neutrons, is 145u. It is an isotope. This means that it has a different number of neutrons (84) than the number of electrons and protons (61). Every element changes states of matter at different temperatures. Promethium melts at 1042.0°C (1315 Kelvin), boils at 3000.0°C (3273 Kelvin), and freezes at 931.0°C. Its normal phase is synthetic, but is used as a solid or liquid. Promethium costs $0.50 per Curie. A Curie (Ci)
is a measure of radioactivity that is equivalent to 1 gram.

Promethium is in the 6th period, which includes Lead, Mercury, Gold, and Platinum. It is a Lanthanide, one of 15 elements that used to be called Rare Earth Metals. Promethium is highly radioactive. This means that it’s good for atomic batteries, x-rays, and guided missiles. When heated, Promethium glows green or blue, due to a chemical reaction in the salts. There are only three compounds that contain Promethium. They are:
Promethium Chloride---Cl3Pm---Used for luminous paints
Promethium Oxide---Pm2O3---Used in Nuclear Reactors
Promethium Fluoride---PmF3---Found in Smoke Alarms

Promethium is, overall, one of the most dangerous elements due to its radioactiveness. Since it’s an isotype, it’s also one of the hardest elements to find, though it has many uses. Promethium-It’s a Freemium!
References
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Promethium (Pm) (E. Britannica, Ed.). Encyclopedia Britannica. Retrieved November 20, 2017, from https://www.britannica.com/science/promethium

Promethium 61. Periodic Table of Elements: Los Alamos National Laboratory. Retrieved November 17, 2017, from http://periodic.lanl.gov/61.shtml

PROMETHIUM. Chemistry Explained. Retrieved November 20, 2017, from http://www.chemistryexplained.com/elements/P-T/Promethium.html

(2017). Promethium (R. Of Chemistry, Comp.). Royal Society of Chemistry. Retrieved November 13, 2017, from http://www.rsc.org/periodic-table/element/61/promethium

Promethium: The essentials. WebElements Periodic Table. Retrieved November 15, 2017, from https://www.webelements.com/promethium/
Stewart, D., Dr. (2012, October 18). Promethium Element Facts / Chemistry.
Promethium. Retrieved November 15, 2017, from https://www.chemicool.com/elements/promethium.html