Potassium argon and argon argon dating techniques are used on
As with any dating technique, there are some significant limitations.
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If one of these protons is hit by a beta particle, it can be converted into a neutron.
It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).
By comparing the proportion of K-40 to Ar-40 in a sample of volcanic rock, and knowing the decay rate of K-40, the date that the rock formed can be determined.
By far the most common isotope of potassium has only 20 neutrons.
The result is that potassium has a lower atomic mass (or atomic weight) than argon, despite having the extra proton.