Which list contains all the noble gases?

Which list contains all the noble gases?

• A. Helium, Neon, Argon, Krypton, Xenon, Radon, Oganesson
• B. Hydrogen, Helium, Neon, Argon
• C. Helium, Neon, Argon
• D. Helium, Neon, Argon, Krypton, Xenon, Radon

Answer: (A)

Noble gases are elements in Group 18 with full outer electron shells, which makes them very stable and largely unreactive. They exist as single atoms and are gases at room temperature. The complete set includes helium, neon, argon, krypton, xenon, radon, and oganesson. So the list that contains all of these is the correct one. Lists that include hydrogen aren’t correct because hydrogen is not a noble gas, and lists that omit any of the noble gases are incomplete.

Noble gases are elements in Group 18 with full outer electron shells, which makes them very stable and largely unreactive. They exist as single atoms and are gases at room temperature. The complete set includes helium, neon, argon, krypton, xenon, radon, and oganesson. So the list that contains all of these is the correct one. Lists that include hydrogen aren’t correct because hydrogen is not a noble gas, and lists that omit any of the noble gases are incomplete.