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When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.

Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.

These break down over time in a process scientists call radioactive decay.

Each atom has a positively charged nucleus surrounded by negatively charged electrons.

The electric force between the nucleus and electrons holds the atom together.

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