Radon (Rn), element 86 – Learn Acer periodic table

Radon

Noble gas, atomic number 86.

Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.

Facts

Symbol Rn. Atomic mass 222.0 u. Group 18, period 6. Electron configuration [Xe] 4f14 5d10 6s2 6p6. Electrons per shell 2, 8, 18, 32, 18, 8. State at room temperature: Gas. Melting point -71.1 °C, boiling point -61.6 °C. Discovered by Friedrich Ernst Dorn.

Element data from Wikipedia, CC BY-SA 3.0.