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Some radioisotopes with the longest half-lives can remain radioactive for ________ of years. A. billons B. millions C. thousands D. tens of thousands
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Some radioisotopes with the longest half-lives can remain radioactive for ________ of years.

A. billons
B. millions
C. thousands
D. tens of thousands

User Roman Puchkovskiy
by
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1 Answer

6 votes
A: billions of years :)
Tellerium -128's half life is longer than she existence of the universe!
xenon- 136 has a half life of 10^21 years.
User Kamran Amini
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