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The rates of decay of various radioactive isotopes have been accurately measured in the laboratory and have been shown to be constant, even in extreme temperatures and pressures.

These rates are usually expressed as the isotope's half-life--that is, the time it takes for one-half of the parent isotopes to decay.

These each have 19 protons and 21 neutrons in their nucleus.

If one of these protons is hit by a beta particle, it can be converted into a neutron.

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Some isotopes are stable, but some are unstable or radioactive.

The discovery gave scientists a tool for dating rocks that contain radioactive elements.

Many elements have naturally occurring isotopes, varieties of the element that have different numbers of neutrons in the nucleus.

Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).

One out of every 10,000 Potassium atoms is radioactive Potassium-40 (K-40).




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