Some substances release ____, visible and ____ violet radiation when they are ____ or when an electrical ____ is passed through them, while other substances release radiation ____ the time. ____ Becquerel discovered that ____ salts gave off radiation as it developed some ____ film below the salts, but the radiation could not get through the metal ____ under the salts indicating that metal might ____ this radiation. ____ Curie worked with Becquerel and identified other radioactive ____ that, like uranium, release radiation all the time. She named one of these substances ____, after her country, ____. At the time ____ was unaware of the ____ of working with radioactive sources and even now, ____ years after her death, her body is still ____ and is sealed in a ____ lined coffin and no-one can touch her scientific ____ as the radiation they release can cause ____. ____ Rutherford studied some radioactive substances and discovered that there were at least ____ types of radiation released. He identified and named ____ radiation as a ____ penetrating form, and ____ radiation as a form that could travel through ____ material before being ____. ____ also went on to discover that all atoms have ____ charges located in their ____. We now refer to those charges as ____. ____ discovered this using ____ particles which he fired at a piece of ____ foil. Most of these ____ alpha particles went ____ through the gold indicating that most of the atom is ____ space. A few alpha particles were ____ if they were fired near the ____ of the gold atoms as they were ____ by the positive charges there.

radioactivity discovery

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