Question

why are the element of group 18 known as noble gas

Answer 1

HEYA!!
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↪The Elements of Group 18 are Called " Noble Gases " as these elements have a completely filled Octet . That is they posses 8 electrons in their outermost shell and hence they do not react at all with other elements.

↪Examples are Neon , Argon , Krypton, Radon.

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Answer 2

The elements present in group 18 have their valence shell orbitals completely filled & therefore react with a few elements only under certain condition.

Therefore, they are known as noble gas.