The element between chlorine and potassium on the periodic table is argon (Ar), with an atomic number of 18. Argon is a noble gas, meaning it is colorless, odorless, and almost entirely inert. Due to its stability, argon is used in applications where reactivity is undesirable, such as in incandescent light bulbs to prevent the filament from oxidizing, and as a shielding gas for welding. Argon is also the most abundant noble gas in Earth's atmosphere, comprising approximately 0.93% of its volume.
