Radium-b
noun, Chemistry.
1.
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.
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- Radiuses
[rey-dee-uh s] /ˈreɪ di əs/ noun, plural radii [rey-dee-ahy] /ˈreɪ diˌaɪ/ (Show IPA), radiuses. 1. a straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. 2. the length of such a line. 3. any or radiating part. 4. a […]