| − | An '''inert substance''' is an [[element]] which does not easily react with other chemicals. Most of the group 8 gases ([[Argon]] etc.) in the [[periodic table]] are classified as inert, due to their having full outer electron shells. | + | An '''inert substance''' is an [[element]] which does not easily react with other chemicals. Most of the group 8 gases ([[Argon]] etc.) in the [[periodic table]] are classified as inert, due to their having full outer electron shells. Such substances are useful when working with very reactive substances; for example, reactions that would become uncontrollable in the presence of [[oxygen]] can be conducted in an [[atmosphere]] of argon. |