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03-Dec-2019 10:29

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Protons and neutrons together are called nucleons, meaning particles that can appear in the atomic nucleus.A nuclide of an element, also called an isotope of an element, is an atom of that element that has a specific number of nucleons.Some nuclides have very long half-lives, measured in billions or even trillions of years.Others have extremely short half-lives, measured in tenths or hundredths of a second.

All these methods point to Earth being very, very old -- several billions of years old.

In alpha decay, the radioactive atom emits an alpha particle.

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