Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95a: 18

All but $_{18}^{9}X$ are isotopes of X.

Work Step by Step

Since the element has an atomic number of 9, all species with an atomic number of 9 are X's isotopes, so all but $_{18}^{9}X$ are isotopes of X.

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.