The correct answer is (a) Neon.
Noble gases are elements in group 18 of the periodic table. They are all gases at standard temperature and pressure and are very unreactive. This is because they have a full valence shell of electrons, which makes them very stable.
Neon is a noble gas with the symbol Ne and atomic number 10. It is a colorless, odorless, and tasteless gas that is found in the Earth’s atmosphere. Neon is used in neon signs, lasers, and other applications.
Chlorine is a chemical element with the symbol Cl and atomic number 17. It is a pale yellow-green gas at standard temperature and pressure and is an extremely reactive element. Chlorine is used in bleach, disinfectants, and other applications.
Hydrogen sulfide is a chemical compound with the formula H2S. It is a colorless, flammable gas with a rotten egg smell. Hydrogen sulfide is found in natural gas and is used in some industrial applications.
Ammonia is a chemical compound with the formula NH3. It is a colorless, flammable gas with a pungent smell. Ammonia is used in fertilizers, explosives, and other applications.