Question on: SS1 Physics - Modern Physics

Isotopes are different forms of the same element that have the same number of protons but different numbers of neutrons. The atomic number of an element remains the same for all isotopes, indicating the number of protons, but the atomic mass varies. Isotopes have different mass numbers, which represent the total number of protons and neutrons in the nucleus. Due to the difference in the number of neutrons, isotopes can have slightly different physical properties and different atomic masses.