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Radium was discovered by Marie Curie and her husband Pierre Curie in 1898. They isolated radium from the mineral pitchblende (uraninite) and identified it as a new element. Marie Curie coined the term “radioactivity” to describe the spontaneous emission of radiation by certain elements, including radium. Their discovery of radium contributed significantly to the field of nuclear physics and earned Marie Curie the Nobel Prize in Physics in 1903, making her the first woman to win a Nobel Prize.