23-02-2021
Chemistry

contestada

If we start with 20 atoms of plutonium – 239, how many would remain after 48,240 years?

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Eduard22sly Eduard22sly

13-06-2022

The amount of atoms of plutonium – 239 that would remain after 48240 years is 5 atoms

How to determine the number of half-lives

Half-life (t½) = 24100 years
Time (t) = 48240 years
Number of half-lives (n) =?

n = t / t½

n = 48240 / 24100

n = 2

How to determine the amount remaining

Original amount (N₀) = 20 atoms
Number of half-lives (n) = 2
Amount remaining (N) = ?

N = N₀ / 2ⁿ

N = 20 / 2²

N = 20 / 4

N = 5 atoms

Learn more about half life:

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