an isotope of polonium: polonium 210.
What’s The Origin Of The F-word?It's one of the most versatile words in the English language, but where did the F-word really come from? Originally, the naughtiest of naughty words was actually quite an acceptable word, though no English speaker would say that today.
Origin of radium F
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for radium f
Turning to the other end of the radium series we are led to ask what becomes of radium-F when in turn it disintegrates?Darwin and Modern Science|A.C. Seward and Others