Question

1. the weighted average of the atomic masses of the naturally occurring isotopes of an element is called the ______. (1 point)

• atomic number
• mass number
• average atomic mass
• isotope

Explanation:

The weighted - average of the atomic masses of an element's naturally - occurring isotopes is defined as the average atomic mass. The atomic number is the number of protons, the mass number is the sum of protons and neutrons, and an isotope is a form of an element with a different number of neutrons.

Answer:

C. average atomic mass