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After placing the uranium in an enclosed spot with no sunlight at all, Becquerel expected that the paper would be clear and free of dark spots.

These isotopes differ from each other in the number of uncharged particles (neutrons) in the nucleus.­You've probably heard people talk about radiation both in fiction and in real life.For example, when the Enterprise approaches a star on "Star Trek," a member of the crew might warn about an increase in radiation levels.Alpha decay of the The sum of the mass numbers of the products (234 4) is equal to the mass number of the parent nuclide (238), and the sum of the charges on the products (90 2) is equal to the charge on the parent nuclide.Nuclei can also decay by capturing one of the electrons that surround the nucleus.