A) Rubidium (Rb, Z = 37) : Alkali metals
B) Barium (Ba, Z = 56) : Alkaline earth metals
C) Iridium (I, Z = 77) : Nobel gases
D) Argon (Ar, Z = 18) : Nobel gases
Correct Answer: C
Solution :
Iridium \[[I,Z=77]\] is not belong to noble gas.
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