Radon

==== Radon: radons group number is 18 and the period number is 6. Radon was discovered by Friedrich Ernst Dorn in 1900. Radon is a colourless element but is one of the biggest causes of lung cancer. Radon stays a gas in a room temperature environment. It's mass is 222 u and it's atomic number is 86. It's boiling point is 61.85 °C, and it's melting point is 71.15 °C. Radon is a nonmetal element. The amount of neutrons is has is 136, the amount of protons it has is 86, and the amount of electrons it has is 86. Radon actually causes up to 21,000 deaths a year! Radon is in all types of homes. 1 in 15 homes in the u.s. have high radon levels. For safety reasons people get radon reduction, this costs from $800-$1200, the average amount being $1200. ====