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There are 42 known isotopes of polonium (₈₄Po), all radioactive, stretching from ¹⁸⁶Po to ²²⁷Po. The isotopes 210 through 218 occur naturally in the four principal decay chains; of these, ²¹⁰Po with a half-life of 138.376 days has the longest half-life and is, therefore, the most abundant by mass. It is also the most easily synthesized isotope, by neutron capture

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