Group 18 Elements (Noble Gases)
Noble Gases: The elements Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn) constitute group 18 of the long form of the periodic table. Except for Rn, all other elements are present in the atmosphere in very small quantities, and hence, they are known as Rare gases of the atmosphere. Sometimes, these …