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There are over 800 radioactive isotopes, some of which are natural and some synthetic.
Carbon-12 is a stable isotope, while carbon-14 is a radioactive isotope (radioisotope). Isotope (noun), Isotopic (adjective), Isotopically (adverb), Isotopy (noun)The term "isotope" was introduced by the British chemist Frederick Soddy in 1913, as recommended by Margaret Todd.
Uranium-235 and uranium-238 occur naturally in the Earth's crust. The word means "having the same place" from the Greek words "place".
The physical properties of isotopes are different from each other since these properties often depend on mass.
This difference may be used to separate isotopes of an element from each other by using fractional distillation and diffusion.
For more than a hundred years the best method of arranging its history was the use of fossils or biostratigraphy.