Final answer:
An inert element is an element that has a full outer electron shell and does not readily react with other elements.
Step-by-step explanation:
An inert element is an element that has a full outer electron shell. This means that it does not readily react with other elements because it is stable in its current form.
For example, the noble gases (such as helium, neon, and argon) have full outer shells and thus do not typically react with other elements.
Chemistry, High School, inert element