Question

If an isotope of uranium, uranium-235, has 92 protons, how many protons does uranium- 238 have?

A. 92
B. 95
C. 197
D. 276

Answer 1

A. 92

Answer 2

92 because the number of protons doesn't change but the amount of neutrons can.

Answer 3

Any specific element (uranium in this case) is defined by the number of protons it has.
The number of neutrons (and hence the total nuclide count), determines the isotope of that element.