Chapter 5, Problem 31E

The atomic masses of the natural isotopes of neon are $19.99244\text{ u}$, $20.99395\text{ u}$, and $21.99138\text{ u}$ . The average of these three masses is $20.99259\text{ u}$ . The atomic mass of neon is listed as $20.1797\text{ u}$ on the periodic table. Which isotope do you expect is the most abundant in nature? Explain.

When neon gas is within an activated gas discharge tube, reddish-orange light is emitted.