Noble Gas

Another name of noble gas is inert gas. It contains eight electrons in outermost orbit except Helium (He). The all-inert gas is our helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). It exhibits great stability and very low reaction rates. They are all odourless, colourless monatomic gases. Helium is the lightest of the noble gases.