• question_answer Which of the following element does not belong to the family of elements indicated [Orissa JEE 1997] 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

Iridium $[I,Z=77]$ is not belong to noble gas.