Question

All atoms of the same element have the same:

Answer 1

They have the same number of protons

Answer 2

Answer:

Number of protons

Explanation:

The number of protons (the atomic number) determines the identity of the element.

The number of neutrons may differ, in which case the mass and the mass number (number of protons + neutrons) will differ, but all atoms of the same element will have the same number of protons.