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Rare Earth
- any element of the lanthanide series (atomic numbers 57 through 71)
- any element of the lanthanide series (atomic numbers 57 through 71)
Rare-Earth Element
- any element of the lanthanide series (atomic numbers 57 through 71)
- any element of the lanthanide series (atomic numbers 57 through 71)
Radiocarbon
- a radioactive isotope of carbon
Radiocarbons
- a radioactive isotope of carbon
Radiochlorine
- a radioactive isotope of chlorine
Radiochlorines
- a radioactive isotope of chlorine
Radia
- an intensely radioactive metallic element that occurs in minute amounts in uranium ores
Radium
- an intensely radioactive metallic element that occurs in minute amounts in uranium ores
Radon
- a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
Radons
- a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health