The correct sequence of the number of shells in noble-gas atoms is Xenon 54 (131.29), Krypton 36 (83.8),Neon 10 (20.180),Helium 2 (4.003)
The noble or inert gases are in Group 8A. Helium, neon, argon, krypton, xenon, and radon are the noble gases, or inert gases, that make up group 8A (or VIIA) of the periodic table (Rn). The name of these elements refers to how little they react with other elements or compounds. The heaviest noble gas is radon, having a density of about 4.4 grams per cubic centimeter. Radon is a radioactive noble gas that has no flavor, smell, or color. The densest of the noble gases, radon is one of the densest gases at ambient temperature. Helium is utilized for arc welding, providing an inert protective environment for the production of fiber optics and semiconductors. Additionally, leaks in systems like car air conditioning can be found using helium.
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