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All of the noble gases have full valence shells, such as neon, xenon, and krypton. They all have 8 valence electrons, with the exception of helium, which has 2.

Helium , Neon , argon, xenon and radon  all are noble gases and have full valence shell of electron

What are noble gases ?

The noble gases (Group 18) are located in the far right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactive.

The 18th group in the modern periodic table is of noble gases, because their outer most shell is completely filled as it have 8 electrons in the outermost shell , except helium which have 2 electrons in outermost shell ( He have only one shell )

Helium , Neon , argon, xenon and radon  all are noble gases and have full valence shell of electron

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