Question

Ten radioactive elements​

Answer 1

Radioactive Elements

Element Most Stable Isotope Half-life

of Most Stable Istope

Technetium Tc-91 4.21 x 106 years

Promethium Pm-145 17.4 years

Polonium Po-209 102 years

Astatine At-210 8.1 hours

Radon Rn-222 3.82 days

Francium Fr-223 22 minutes

Radium Ra-226 1600 years

Actinium Ac-227 21.77 years

Thorium Th-229 7.54 x 104 years

Answer 2

Technetium. Tc-91 4.21 x 106 years

Promethium. Pm-145 17.4 years

Polonium Po-209 102 years

Astatine At. -210 8.1 hours

Radon Rn-. 222 3.82 days

Francium Fr-. 223 22 minutes

Radium Ra-. 226 1600 years

Actinium Ac-. 227 21.77 years

Thorium Th-. 229 7.54 x 104 years

Protactinium Pa-. 231 3.28 x 104 years

Uranium U-. 236 2.34 x 107 years

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