They are equal amounts of energy.
Work Step by Step
The amount of energy required to put an atom onto a gaseous element, would be the same amount of energy released by that element when the electron is removed (ionized).
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.