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The atoms in each chemical element may vary slightly in the numbers of neutrons within their nuclei.

These slightly different atoms of the same chemical element are called isotopes of that element.

This is an enormous branch of geochemistry called Geochronology.

It is an accurate way to date specific geologic events.

Furthermore, Parentium and Daughterium are so different in chemical properties that they don't otherwise occur together.

If there were such a pair of isotopes, radiometric dating would be very simple.

As one example, the first minerals to crystallize (condense) from the hot cloud of gasses that surrounded the Sun as it first became a star have been dated to 4568 plus or minus 2 million years....!! Other events on earth can be dated equally well given the right minerals.

The nucleus contains protons (tiny particles each with a single positive electric charge) and neutrons (particles without any electric charge).

Orbiting around the nucleus are electrons (tiny particles each with a single electric charge).

Answer 2: Yes, radiometric dating is a very accurate way to date the Earth.

We know it is accurate because radiometric dating is based on the radioactive decay of unstable isotopes.

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