Samples of the following isotopes in pure form, each containing the same number of atoms, are taken. After one year, which sample would still contain the most atoms of the original substance?

Question

Quizplus · Accepted Answer

Strontium-90 has the longest half-life among the given isotopes,  which means it takes the longest time for half of the sample to decay. Therefore, after one year, most of the strontium-90 sample would still exist in its original form compared to the other isotopes.

Samples of the Following Isotopes in Pure Form, Each Containing