What is chemically inactive like helium?

Chemically inactive elements, also known as noble gases, have a complete outermost electron shell, which makes them highly stable and unreactive. These elements include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Helium, for example, is a non-metal and the second lightest element in the periodic table. It has two electrons in its outer shell, which are tightly bound to the nucleus. Due to its stable electronic configuration, helium is inert and does not easily react with other elements to form compounds.

Because of their chemical stability, noble gases have a variety of practical applications, such as being used in lighting, welding, and cryogenics. They are also used in the production of semiconductor devices and as a carrier gas in gas chromatography.