By Sarah Boyer


Radon was discovered in 1900 by Friedrich Ernst Dorn in Germany. He found it being released by thorium.

Friedrich Ernst Dorn

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Applications and Uses

Radon is useful for cancer treatment. It is most commonly found in rocks.
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Properties of Radon

Radon has an Atomic Mass of 222. It's Atomic Radius is 120 pm. It's density is 9.73 g/l. It's melting point is -71 Degrees Celsius. At room temperature, radon is a gas. It is invisible, colorless, and odorless. It is not flammable and has a high reactivity.
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Radon's Atomic Structure

Radon's Atomic Number is 86. It's mass number is 222. It has 86 protons, 136 neutrons, and 86 electrons.


Radon-222 is the most common isotope. it is thought t be responsible for 20,000 lung cancer deaths each year.

Compounds: Radon Difluoride

Radon Difluoride is less reactive than many other compounds.
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This is where radon is located on the Periodic Table.

Name & Symbol

The name radon comes from the word radium. The symbol for radon is Rn.

Fun Facts

*It is the heaviest known gas.

*The earth's atmosphere is 0.0000000000000000001% radon on average.
*The name radon came from the word radium.