Comparing and contrasting the properties of elements and their radioactive isotopes
Isotopes are atoms of the same element and have the same amount protons but a different amount of neutrons. They also have the same atomic number but a different mass number. (Nuclear Science Division ---- Lawrence Berkeley National Laboratory 2007)
Radioactive isotopes happen when the isotope does not occur naturally and a new combination of neutrons and protons combine to make the atom unstable. These atoms are made artificially. (world-nuclear.org, 2007).
Isotope picture
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