Which of the following is the heaviest gas?

Explanation

The correct answer is Radon. Key Points The radioactive gas radon has no flavor, color, or odor. Radon is the heaviest gas. All rocks and soils contain uranium , which naturally decays into radon in the process. Water can contain radon as well. High amounts of radon, a naturally occurring radioactive gas , can be found in enclosed spaces like houses and offices Radon is one of the leading causes of lung cancer. Symbol: Rn Atomic number: 86 Additional Information Oxygen: The chemical element with the atomic number 8 and symbol Ois called oxygen. It belongs to the periodic table's chalcogen group. Helium: Chemical element helium has the atomic number 2 and the symbol He . It is the first member of the noble gas group in the periodic table. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas. Nitrogen: The chemical element with the atomic number 7 and the letter N is known as nitrogen . The lightest non-metal in group 15 is nitrogen.