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Iridium was originally found as a contaminant (with the element osmium) in platinum, and it was from the solid remnants left when platinum was dissolved in a mix of sulphuric and hydrochloric acids that Tennant made his discovery of both elements.

Iridium - Element information, properties and uses | Periodic Table

rsc : periodic-table : element : iridium

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Astatine was discovered by D. Corson and co-workers in 1940 by bombarding a bismuth target with alpha particles. The most stable isotope of this element has a half-life time of only 8.1 hours.

Astatine - News and events, University of York

york.ac.uk : news-and-events : news : research : astatine

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