Engelsk navneord: atomic number 86 | |||
1. | atomic number 86 (om masse el. substans) 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 | ||
Termer med samme betydning (synonymer) | radon, Rn | ||
Mindre specifikke termer | argonon, chemical element, element, inert gas, noble gas | ||