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Geologists regularly use five parent isotopes to date rocks: uranium-238, uranium-235, potassium-40, rubidium-87, and samarium-147.
After all, textbooks, media, and museums glibly present ages of millions of years as fact.
Yet few people know how radiometric dating works or bother to ask what assumptions drive the conclusions.
Orbiting around the nucleus are electrons (tiny particles each with a single negative electric charge).
The atoms of each element may vary slightly in the numbers of neutrons within their nuclei.