noble gas
Radon is an inert or "noble" gas.
neon is a noble gas.
Neon is in the noble gas family.
Uranium is a not a noble gas, but a metal, solid, radioactive, member of the actinides (actinoids) family.
Helium is a gas, belonging to noble gases (group 18)
Noble gases belong to group 0 and can be found on the extreme right column of the periodic table of elements. The heaviest noble gas would be radon, whose atomic mass is still uncertain. The element which appears below radon in the column, ununoctium, has not been confirmed as a noble gas.
noble gas family, group 18
The noble gas group contain: helium, neon, argon, krypton, xenon, radon, Uuo.
Lead is a not a noble gas; lead is a post-transition solid metal, group 14 , period 6 of the periodic table of Mendeleev.
Radon is an element of group 18. This is the group of the noble gases.
Helium belongs in the noble gas family, which is group 18 (VIIIA or 0) on the periodic table. It is a noble gas because its valence shell is filled (with two electrons) and it is completely non-reactive.