Noble gases are elements in Group 18 of the periodic table, characterized by their low reactivity. The common noble gases are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn). Actinium (Ac) is an element with atomic number 89 and is the first element of the actinide series (f-block elements). It is a radioactive metal.
Which of the following elements is not a Noble gas?
Asked in UPPCS Prelims 2023 · Topic: Sulphur, Nitrogen, Halogen, Inert Gases (Inert Gases (Noble Gases): Occurrence, isolation, general characteristics, and uses)
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