Tofauti kati ya marekesbisho "Unururifu"

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==Tovuti za nje==
* [[http://www.chem4kids.com/files/atom_nucleus.html Dangerous Particles Chem 4 kids]]
* [[http://www.physics.org/article-questions.asp?id=71 {{Wayback|url=http://www.physics.org/article-questions.asp?id=71 |date=20141023073143 }} What is radioactivity? physics org]]
* [[http://chemistry.about.com/od/chemistryfaqs/f/radioactivity.htm What is radioactivity? chemistry.org]]