Explain potassium 40 dating who is chris perez dating

the geologist only needs to measure the relative amounts of potassium-40 and argon-40 in the rock at the present time to be able to calculate an age for the rock.Although it is a simple calculation the big question is whether his assumptions about the rock were correct.He imagines that his radioactive hour glass sealed when the rock solidified, and his radioactive clock started running.And he hopes the rock has remained sealed until the time he collected his sample.

For example, if the age is higher than he expected he will say that his rock contains ‘excess argon’ or ‘parentless argon’.

And we know if an atom has 19 protons it is going to be potassium.

We know that if it's potassium that atom has 19 protons.

Potassium 40 is an isotope with 19 protons (and electrons) and 21 neutrons.

Potassium 40 accounts for around 0.012% of potassium and is fairly stable (half life of 1.25 billion years).

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