All the isotopes of a given atom have(1) the same mass number and the same atomic number(2) the same mass number but different atomic numbers(3) different mass numbers but the same atomic number(4) different mass numbers and different atomic numbers
Isotopes of an element have different neutron (And therefore mass, because neutrons have a mass of 1) numbers, but the same proton (And therefore atomic) numbers. So the answer is (3) different mass numbers but the same atomic numbers
