Answer:
Number of protons
Explanation:
Uranium is a radioactive chemical element of the actinoid series. It is a f-block element having atomic number (Z) 92, that has three unstable isotopes: uranium-238, uranium-235 and uranium-234
As, atomic number (Z) is equal to number of protons present in an atomic nucleus. So, the number of protons in an uranium atom is 92.
Since, isotopes have same number of protons and different number of neutrons.
Therefore, all the isotopes of uranium, have the same atomic number and same number of protons.
