noble gases
Radon is an inert gas. The so-called noble gases are in column 18 of the Periodic Table, and radon is at the bottom.
Radon is an inert or "noble" gas.
The noble gases belong to the noble family. These include helium, neon, argon, krypton, xenon, and radon. They are inert gases that have a full valence shell of electrons, making them stable and unreactive.
Radon is an element of group 18. This is the group of the noble gases.
Arachnid family
Metals
Halogen
percussion
oboe
Americium is a member of the actinoids family.
Meitnerium is a member of the transactinoids family.
Helium is one of the six Noble Gases, along with Neon, Argon, Krypton, Xenon, and Radon.