RN

名词 rn:

1. 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
   同义词：radon, atomic number 86
2. a graduate nurse who has passed examinations for registration
   同义词：registered nurse

Rn
NONE（无词性）
The symbol for the element radon
元素radon的符号