Which of the following is not a very long- lived, radioactive isotope?
A)Rb- 87
B)K- 40
C)C- 14
D)U- 238

Name: Which of the following is not a very long- lived, radioactive isotope? A)Rb- 87 B)K- 40 C)C- 14 D)U- 238
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Out of the given isotopes, C-14 has the shortest half-life (approximately 5730 years) and is used for dating materials only up to about 50,000 years old. The other isotopes have much longer half-lives and can be used for dating materials that are millions or billions of years old.

Which of the Following Is Not a Very Long- Lived