Answer:
all atoms of a given element have the same number of protons but may have different masses
Explanation:
After the discovery of isotopes, scientists were able to conclude that all atoms of a given element have the same number of protons but may have different masses.
Isotopes are atoms of an element that have the same atomic number but different mass number.
The atomic number is the number of protons within an atom.
Mass number is the number of protons and number of neutrons.
Therefore, all atoms of a given element have the same number of protons but different mass.
