Reference Terms
from Wikipedia, the free encyclopedia


Radon is a chemical element in the periodic table that has the symbol Rn and atomic number 86.

A radioactive noble gas that is formed by the disintegration of radium, radon is one of the heaviest gases and is considered to be a health hazard.

Note:   The above text is excerpted from the Wikipedia article "Radon", which has been released under the GNU Free Documentation License.
Related Stories

Matter & Energy News
May 25, 2017

Latest Headlines
updated 12:56 pm ET