Fermium (Fm) is a synthetic element with the atomic number 100. It is part of the actinide series in the periodic table. Isotopes of fermium are all radioactive, as fermium has no stable isotopes. The most notable isotopes of fermium include: 1. **Fermium-257 (Fm-257)**: This is the most stable isotope of fermium, with a half-life of about 100.5 days.
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