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.
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.
Source: Wikipedia "Isotopes of polonium" · CC BY-SA 4.0
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