The noble gases are a group of six gases (helium, neon, argon, krypton, xenon and radon) found in row 18 of the periodic table. Noble gases react so rarely that most people consider them inert.
The noble gases on the period table get heavier the further down the column they are; meaning radon weighs the most out of all currently known noble gases.
Radon has an atomic weight of 222 atomic mass units (amu). Atomic weight refers to the number of neutrons and protons contains by a single atom of a molecule.
About half of a cubic foot of radon at 76 degrees Fahrenheit and at normal atmospheric pressure weighs 222 grams. Water at the same amount and conditions would weigh 18 grams.
Despite being the heaviest known noble gas, radon still readily floats in air; it has an average density of 0.00973 grams per cubic centimeter, although it can compress into a liquid at -62 degrees Celsius and a solid at -71 degrees Celsius.
Radon emits radioactive beta and gamma particles that can cause cancer. Except for smoking, radon leads to the most cancer deaths each year.
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