Radioactivity

Radioactivity was discovered in 1896 by the French physicist, Antoine Henri Becquerel. He left an unexposed photographic plate in the dark near a sample of a uranium salt. When the plate was developed it was found to be fogged , just as it might if it had been exposed to light. which was caused by a form of radiation from the uranium. The term radioactivity was coined by Marie Curie and her husband Pierre Curie. They worked together and showed that radioactivity was an atomic property, not a chemical change. The discovery of radioactivity won the Curies and Ecquerel Nobel Prize for Physics in 1903.