Marie Skoldowska Curie
The Curies discovered two radioactive elements: polonium and radium.
Polanium
Marie Curie. Uranium was discovered in 1789 by the German chemist Martin Heinrich Klaproth working in Berlin.
Radioactivity is discovered on uranium.
Marie and Pierre Curie
he discovered the radioactive element Uranium......
The artificial radioactive element curium (Cm).
First made in 1950 at the University of California. It is a radioactive metallic chemical element
French scientist Henri Becquerel discovered radioactive elements.
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.
As radioactive element is an element that is on the Priodic Table of Elements. A Radioactive Element is usually radioactive.
non radioactive element