Inert - GCSE Chemistry Definition

Inert refers to a substance that does not react easily with other substances. In chemistry, this term is often used to describe elements or compounds that have little or no chemical reactivity. A well-known group of inert elements is the noble gases, like helium and argon, which are stable and unlikely to form chemical bonds with other elements because they have a full outer shell of electrons. Being inert is important in many chemical processes, as these substances can be used to create a stable environment where other reactions can safely occur. For example, argon, is used in welding to protect hot metal from reacting with oxygen in the air.