Radioactive Elements There are naturally occurring radioactive elements and artificial ones. Natural radioactive elements include radium, uranium, plutonium, thorium etc. Artificial radioactive elements are made by using neutrons and protons to bombard the normal atoms of sulphur, iodine and cobalt include sulphur-35, iodine-131 and cobalt-60. They are artificial isotopes and so are called radio-isotopes since…
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