Polonium is a radioactive metallic element, chemical symbol Po, discovered in 1898. It is highly radioactive and rare in nature, producing heat and alpha radiation. Used historically in research and as a heat source for space equipment, it remains a symbol of early nuclear science.
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0:58Oxygen
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0:58Palladium
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1:00Phosphorus
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0:57Platinum
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0:59Polonium
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0:55Polymer
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1:00Potassium
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1:05Praseodymium
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0:57Rhodium
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1:00Roentgenium
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