Polonium-210 is a radioactive isotope of the element Polonium, which is part of the chalcogen group in the periodic table. It was discovered by Marie Curie in 1898 and is known for its intense radioactivity. Polonium-210 emits alpha particles and has a half-life of about 138 days, making it a significant source of radiation. This isotope occurs naturally in trace amounts in uranium ores and can also be produced artificially in nuclear reactors. Due to its high toxicity and radioactivity, Polonium-210 is used in certain applications, such as in anti-static devices and as a heat source in space equipment.