Definition of motor for English Language Learners : of, relating to, used in, or involving a vehicle that is powered by a motor (such as a car or motorcycle) : having a motor
Ancient Greeks and Romans used aluminum salts for dressing wounds. However, aluminum metal was not isolated until the 19th century. Danish chemist Hans Christian Ãrsted first produced aluminum in 1825 by reacting aluminum chloride with potassium amalgam. Therefore, Ãrsted is considered to be the discoverer of Aluminum.
The 1789 discovery of uranium in the mineral pitchblende is credited to Martin Heinrich Klaproth, who named the new element after the planet Uranus. EugÃ¨ne-Melchior PÃ©ligot was the first person to isolate the metal and its radioactive properties were discovered in 1896 by Henri Becquerel.