Question

All atoms of the same element:

A. have the same number of atoms
B. have the same number of electrons
C. have the same number of protons
D. have the same number of neutrons

Answer 1

Atoms of the same chemical element do not always have the same mass because, although the number of protons in the nucleus is the same for all atoms of the same element, the number of neutrons is not.

All atoms of the same element ALWAYS have the same number of protons. If the number of protons changes then your element has changed.Protons. (changing the number of protons would change the element)

If you have anymore question, please let me know to clarify it much more for you.