Unit-1 chapter-3 Pg:- 32,33,34

Noble gases, also historically known as inert gases, are a group of elements on the periodic table. They are special because of their unique properties:

·        Group 18:  They belong to Group 18 (also sometimes called Group 8A) of the periodic table.

·        Elements: The common noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Oganesson (Og) is another element sometimes included in this group, but it's synthetic and very rare.

·        Colorless, odorless, tasteless: They are all colorless, odorless, and tasteless gases under normal conditions.

·        Unreactive: The key property of noble gases is their very low chemical reactivity. This is why they were historically called inert gases - they are largely inactive and don't easily form bonds with other elements. This unreactivity is due to their full outer electron shells, a special configuration that makes them stable.

·        Monatomic: Noble gases typically exist as single atoms (monatomic) rather than molecules.

·        Low boiling points:  They all have very low boiling points, meaning they turn into gas at very cold temperatures.

applications of noble gases:

·        Helium (He): Used in balloons and airships due to its lightness and non-flammability.

·        Neon (Ne): Used in brightly colored signs and lighting because it glows a characteristic red color when electrified.

·        Argon (Ar): Used in inert atmospheres for welding and food preservation because it's unreactive.

Krypton (Kr) and Xenon (Xe): Used in some high-performance light bulbs and