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radioactive element does not have any stable isotopes, which means it may spontaneously degenerate. Radioactive elements include uranium, curium and thorium.All elements that have an atomic number higher than 83 are considered radioactive. These elements do not have stable isotopes, which is the primary thing that defines them as radioactive elements.

Some radioactive elements are

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

Protactinium

Pa-231

3.28 x 104 years

Uranium

U-236

2.34 x 107 years

Neptunium

Np-237

2.14 x 106 years

Plutonium

Pu-244

8.00 x 107 years

Americium

Am-243

7370 years

Curium

Cm-247

1.56 x 107 years

Berkelium

Bk-247

1380 years

Californium

Cf-251

898 years

Einsteinium

Es-252

471.7 days

Fermium

Fm-257

100.5 days

Mendelevium

Md-258

51.5 days

Nobelium

No-259

58 minutes

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