Argon (Ar) is a chemical element that is in the 18th group of the periodic table. Therefore, it is considered a noble element. It is a monatomic and a chemically inert element. The melting point of argon is -189.2°C, and its boiling point is -185.9°C. Argon is also the third most abundant element in Earth’s atmosphere, as it makes up roughly 0.9% of the Earth’s atmosphere. Argon is colorless, odorless, tasteless, non-corrosive, non-flammable, and non-toxic.