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those that form during chemical reactions without breaking down).The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes.

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Many isotopes have been studied, probing a wide range of time scales.

Today most people are aware of the important contribution nuclear energy makes in cleanly providing a significant proportion of the world's electricity.

Isotopes are different forms of an atom of the same chemical element.

The boat of a pharaoh was discovered in a sealed crypt and reassembled in a museum near the pyramids (see Fig. The age of our galaxy and earth also can be estimated using radioactive dating.

Using the decays of uranium and thorium, our galaxy has been found to be between 10 and 20 billion years old and the earth has been found to be 4.6 billion years old. Within experimental error, this estimate agrees with the 15 billion year estimate of the age of the Universe.

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