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Stable and Unstable Isotopes Elements can be made up of different isotopes. Different Types of Radioactivity How is it measured?Isotopes are atoms with the same number of protons and electrons, but a different number of neutrons. These are the elements that we see around us and find in nature. Radioactivity is measured using a unit called the "curie". The curie measures how many atoms spontaneously decay each second.

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Sometimes isotopes decay from one unstable isotope into another unstable isotope.

This can happen continuously in a long radioactive chain. As it decays, it transforms through a number of elements including thorium, radium, francium, radon, polonium, and bismuth.

The impact of the radiocarbon dating technique on modern man has made it one of the most significant discoveries of the 20th century.

No other scientific method has managed to revolutionize man’s understanding not only of his present but also of events that already happened thousands of years ago.

Radioactive Decay to other Elements When isotopes decay they can lose some of their atomic particles (i.e.