Isotopes

Isotopes are atoms of the same element with the same number of atoms but a different number of neutrons. Atoms of a same element have the same number of protons, but they can have different numbers of neutrons in the nucleus. This causes a change in the mass of an atom, but doesn't produce a new element.

Hydrogen Isotopes:











The heavier hydrogen atoms are radioactive because they are unstable an tend to break down in the nucleus.