|Born||1 January 1852|
|Died||5 March 1903 (aged 51)|
Discovering the element europium
He was a spectrum specialist. In 1896, he suspected samples of the recently discovered element samarium were contaminated with an unknown element, which he isolated in 1901, naming it europium. In 1898 he used his skills of spectroscopy to help Marie Curie confirm that she had discovered the element radium.
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