Question

half life period of atleast 10 radioactive elements ?

Answer 1

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1. Technetium Tc-91 - 4.21 x 106 years
2. Promethium Pm-145- 17.4 years
3. Polonium Po-209- 102 years
4. Astatine At-210- 8.1 hours
5. Radon Rn-222- 3.82 days
6. Francium Fr-223- 22 minutes
7. Radium Ra-226- 1600 years
8. Actinium Ac-227- 21.77 years
9. Thorium Th-229-  7.54 x 104 years
10. Protactinium Pa-231- 3.28 x 104 years
11. Uranium U-236- 2.34 x 107 years
12. Neptunium Np-237-2.14 x 106 years