Marie Skoldowska Curie
The Curies discovered two radioactive elements: polonium and radium.
Marie Curie. Uranium was discovered in 1789 by the German chemist Martin Heinrich Klaproth working in Berlin.
Polanium
Radioactivity is discovered on uranium.
Marie and Pierre Curie
The artificial radioactive element curium (Cm).
Uranium is the first element known to be radioactive. It was discovered by Henri Becquerel in 1896.
First made in 1950 at the University of California. It is a radioactive metallic chemical element
Francium is radioactive, extremely rare, and was discovered in France (hence the name). It is pretty much useless because of its short half-life and rarity.
non radioactive element
All chemical elements after uranium and promethium, technetium.
Radium was discovered in France by the Curies, in samples of ore from the Austrian Empire, in 1898.