Radon is a chemical element in the periodic table. It is element 86 on the periodic table and its symbol is Rn. It is an odorless, tasteless noble gas. It is quite radioactive and can decay very quickly. 27 isotopes of Radon are known today. The most stable of them has a half life of about 3.8 days.
Radon is a gas and is part of the group known as the noble gases. It does not react with other elements, so it is found pure. Radon is radioactive, meaning that it can give off harmful rays. Some people have high levels of radon in their houses, and this can be very dangerous. A lot of radon can get stuck in the basement of old houses, and so people end up breathing it in. It gets stuck in the lungs and has been known to cause cancer. There are groups that try to make sure there is no dangerous radon in houses.
It can occur naturally in the Earth, but its a very small amount. As elements like Thorium and Uranium decay, some of that gets turned into Radon.
Radon was the fifth radioactive element to be discovered, in 1899 by Ernest Rutherford and Robert B. Owens at McGill University in Montreal, after uranium, thorium, radium, and polonium. In 1899, Pierre and Marie Curie saw that the gas given off by radium remained radioactive for a month. Later that year, Rutherford and Owens noticed different types of them when trying to measure radiation from thorium oxide.
It is sometimes uses in radiation therapy. However it is very dangerous to use.
|Radon in the periodic table|
|Atomic number (Z)||86|
|Group||group 18 (noble gases)|
|Electron configuration||[Xe] 4f14 5d10 6s2 6p6|
|Electrons per shell||2, 8, 18, 32, 18, 8|
|Phase at STP||gas|
|Melting point||202 K (−71 °C, −96 °F)|
|Boiling point||211.5 K (−61.7 °C, −79.1 °F)|
|Density (at STP)||9.73 g/L|
|when liquid (at b.p.)||4.4 g/cm3|
|Critical point||377 K, 6.28 MPa|
|Heat of fusion||3.247 kJ/mol|
|Heat of vaporization||18.10 kJ/mol|
|Molar heat capacity||5R/2 = 20.786 J/(mol·K)|
|Oxidation states||0, +2, +6|
|Electronegativity||Pauling scale: 2.2|
|Covalent radius||150 pm|
|Van der Waals radius||220 pm|
|Spectral lines of radon|
|Natural occurrence||from decay|
|Crystal structure||face-centered cubic (fcc)|
|Thermal conductivity||3.61×10−3 W/(m·K)|
|Discovery||Ernest Rutherford and Robert B. Owens (1899)|
|First isolation||William Ramsay and Robert Whytlaw-Gray (1910)|
|Main isotopes of radon|