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Q.

Elements of group 18 are known as noble gas because :

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a

they were discovered by noble kings of ancient times

b

they were extremely rare in atmosphere

c

none of the above

d

their valence shell orbitals are completely filled  and therefore, react with a few elements only under certain conditions

answer is C.

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Detailed Solution

Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon are the elements that make up group 18. (Rn). These substances, which are known as noble gases because they have completed their outermost orbit, are non-reactive. They hardly ever react with other elements because of their steady electrical structure.

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