Final answer:
The atomic masses of any two elements contain the same number of atoms.
Step-by-step explanation:
The atomic masses of any two elements contain the same number of atoms.
The atomic mass of an element is the total mass of all the protons and neutrons in its nucleus. Since different elements have different numbers of protons and neutrons, their atomic masses vary. However, within a given element, all atoms have the same number of protons and neutrons, so their atomic masses are the same. For example, all carbon atoms have an atomic mass of approximately 12 atomic mass units (u).