Do Isotopes Have The Same Atomic Mass? Do Isotopes have the same atomic mass? Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus. Does isotopes have the same mass?
Do All Elements Have Isotopes? Do all elements have isotopes? All elements have isotopes. There are two main types of isotopes: stable and unstable (radioactive). There are 254 known stable isotopes. All artificial (lab-made) isotopes are unstable and therefore radioactive; scientists call them radioisotopes. What elements have no isotopes? Beryllium-9. Fluorine-19. Sodium-23. Aluminum-27. Phosphorus-31. Scandium-45.