Question

Why are group 18 elements called as noble gases ?

Answer 1

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Answer...

the elements of group 18 are known as noble gases because their valence shell orbitals are completely filled and therefore they react with only few elements under special conditions .

Due to completely filled orbitals they are very less reactive as they do not need to gain or lose electrons.

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Answer 2

Group 18 elements are non_metals and gases at room Temp. they have full valence shells therefore they are very stable on their own.They are unlike to react with other elements.