3; REVIEWS: If the ratio of argon to potassium atoms is 7:1, three half-lives have elapsed.
<h3>Do potassium's half-lives last a long time?</h3>
For potassium atoms, the image result is 7:1, meaning three half-lives have passed. details
A radioactive potassium isotope with a long half-life of 1.25 billion years is known as potassium-40 (40K). About 0.012% (120 ppm) of the total potassium present in nature is contained in it.
<h3>How much of a sample is still there after three half-lives?</h3>
One eighth (12.5%) of the initial sample is still present after three half-lives. The period of time needed for one-half of a sample to traverse through...
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