Polonium facts for kids
Polonium is highly unstable, radioactive and toxic. This makes it difficult to handle. It can be dangerous, even in very small amounts. One gram of Po will self-heat to a temperature of about 500 °C (932 °F). It also vaporizes easily.
The former Russian secret service agent Alexander Litvinenko was murdered by having a tiny amount of polonium put into a drink.
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Polonium Facts for Kids. Kiddle Encyclopedia.