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The Radioactive Element Americium-241 Has a Half-Life of 432 Years

Question 21

Multiple Choice

The radioactive element americium-241 has a half-life of 432 years. How many years will it take a 20-g mass of americium-241 to decay to 7.8 g? Round your answer to the nearest year.


A) 572 years
B) 577 years
C) 582 years
D) 587 years

Correct Answer:

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