Facts about geologic dating

CC0], via Wikimedia Commons' src=" alt="The graph gets progressively taller" width="300" height="300" srcset=" sizes="(max-width: 300px) 85vw, 300px"/An atom that has different number of neutrons but the same number of protons.

This also happens to be the nucleus of a helium atom; helium gas may get trapped in the crystal lattice of a CC BY-SA 4.0], via Wikimedia Commons' src=" alt="Simplified Periodic Table of the Elements" width="477" height="254" srcset=" sizes="(max-width: 477px) 85vw, 477px"/An atom that has different number of neutrons but the same number of protons.

Modern applications of this method have achieved remarkable accuracies of plus or minus two million years in 2.5 billion years (that’s ±0.055%)U.

The existence of these two clocks in the same sample gives a cross-check between the two.

CC BY-SA 1.0], via Wikimedia Commons' src=" alt="" width="474" height="251" srcset=" sizes="(max-width: 474px) 85vw, 474px"/An atom that has different number of neutrons but the same number of protons.

While most properties are based on the number of protons in an element, isotopes can have subtle changes between them, including temperature fractionation and radioactivity.

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