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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  • Tin

    Tin, a chemical element that exists in two forms, one metallic and the other nonmetallic. See more »

  • Titanium

    Titanium, a lustrous, silvery-white, metallic chemical element. Titanium is soft, strong, lightweight, ductile (capable of being drawn into a thin wire), and corrosion-resistant, and can combine with many other metals to form alloys. See more »

  • Uranium

    Uranium, a radioactive, white, metallic element. It is the chief source of nuclear energy in nuclear power plants. See more »

  • Actinide Elements
    Actinide Elements

    Actinide Elements, or Actinides, a series of 15 chemical elements (atomic numbers 89 through 103). See more »

  • Actinium

    Actinium, a radioactive chemical element that occurs in nature in trace amounts as a result of the radioactive decay of uranium and thorium. See more »

  • All That Glitters? 5 Ways to Look Closer at Gold
    All That Glitters? 5 Ways to Look Closer at Gold

    While the word "gold" is often synonymous with luxury and we've been conditioned to consider it the ultimate gift, the truth is far more ugly. Learn more about the 5 ways to look closer at gold. See more »

  • Americium

    Americium, a radioactive chemical element. In pure form, it is a silvery metal. Americium does not occur in nature; it is artificially created. See more »

  • Antimony

    Antimony, a chemical element. It exists in two forms, one metallic and one nonmetallic. See more »

  • Argon

    Argon, a chemical element that is a colorless, odorless, tasteless gas at ordinary temperatures and pressures. See more »

  • Arsenic

    Arsenic, a chemical element. It can exist in several forms; these include metallic (or gray) arsenic and amorphous (or black) arsenic. See more »

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