radium B

radium B

noun Chemistry.
an isotope of lead, formed by decay of radium A, that gives rise to radium C, which is an isotope of bismuth, from which radium D, radium E, and radium F, or polonium 210, are derived.

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Radium B is always a great word to know.
So is polymer. Does it mean:
a vessel, commonly a glass bulb with a long neck bent downward, used for distilling or decomposing substances by heat
a compound of high molecular weight made by adding many smaller molecules or by condensation smaller molecules with the elimination of water or alcohol
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