After 10 years, 1 ÷ 16 of the initial mass is still the same.
Half-life is the length of time it takes for any first-order process or for one-half of a measurement of a radioactive isotope to decay. Half-lives of different isotopes range in length from a few hundredths of a second to billions of years or more.
Take 100 atoms:
After the first half-life (2.5 years): 50% × 100 ÷ 100% = 50 or 1 ÷ 2.
After the second half-life (5 years): 0.5 × 50 = 25 or 1 ÷ 4.
After the third half-life (7.5 years): 0.5 × 25 = 12.5 or 1 ÷ 8.
After the fourth half-life (10 years): 0.5 × 12.5 = 6.25 or 1 ÷ 16.
6.25 ÷ 100 × 100% = 6.25% or 1 ÷ 16.
Read more about the half-life of isotopes at
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