Question

How is the atomic mass of an element determined?

A. by adding the masses of the protons and electrons

B. by adding the masses of the neutrons and electrons

C. by determining the number of protons

D. by adding the masses of the protons, neutrons, and electrons

Answer 1

D

Step-by-step explanation:

Atomic mass is the total mass of protons, neutrons and electrons of an atom at rest