Polonium is a radioactive element with the symbol Po and atomic number 84. It has several isotopes, of which the most notable include: 1. **Polonium-210 (Po-210)**: This is the most well-known isotope of polonium. It has a half-life of about 138 days and is a potent alpha-emitter. Po-210 has been used in various research applications and has gained notoriety due to its use in poisoning cases.
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