The number of atoms that remains after 2 half-lives given that it was originally 700,000 atoms is 175000 atoms.
<h3>What is a radioactive substance?</h3>
Radiation in the form of radiant particles or rays, is the result of a nuclear disintegration. Radioactive materials are atoms that have stored energy and may disintegrate in the future, releasing radiation.
Data obtained from the question
Original amount (N₀) = 700,000 atoms
Number of half-lives (n) = 2
Amount remaining (N) =?
How to determine the amount remaining
The amount remaining after 2 half-lives can be obtained as illustrated below:
N = N₀ / 2ⁿ
N = 700,000 / 4
N = 175000 atoms
Hence, 175000 atoms remain.
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