Chemical elements are substances composed of only one type of atom and they cannot be broken down further. Chemical elements are the simplest forms of matter and each one is assigned a specific atomic number. Check out these articles on chemical elements.



Polonium, a radioactive, metallic chemical element. Polonium is part of the radioactive decay series through which uranium 238 is converted to lead.

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  • Zirconium

    Zirconium, a metallic element that occurs as a hard, gray, crystalline substance and as a noncrystalline blue-black powder. See more »

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