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Radium
Radium was discovered 113 years ago in 1898 by Marie Curie and her husband Pierre Curie. These two scientists were the first to discover radioactivity which occurs within an unstable isotope of an atom. The first element which they learned was radioactive was uranium. Radium forms when the nucleus of a uranium or thorium atom decays. Radium is extremely radioactive! Its most stable isotope, radium 226, has a... Learn more about radium on Colin's Page!