Question

13 compare and contrast how does an elements atomic mass differ from its mass number?

Explanation:

The mass number is the sum of protons and neutrons in a single isotope's nucleus. Atomic mass is the weighted - average mass of all naturally - occurring isotopes of an element, taking into account their relative abundances.

Answer:

The mass number is a whole number representing the sum of protons and neutrons in a specific isotope's nucleus. Atomic mass is a weighted average value that considers the masses and abundances of all the element's isotopes.