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.


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

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  • Nitrogen


    Nitrogen, a chemical element that forms compounds that are essential to life. Free nitrogen (nitrogen not combined with other elements) is a gas at ordinary temperatures and pressures, with no taste, odor, or color. See more »

  • Noble Gases

    Noble Gases

    Noble Gases, or Inert Gases, a group of six chemical elements all of which are highly resistant to chemical action; that is, chemically inert. See more »

  • Oxygen


    Oxygen, a nonmetallic chemical element that is contained in air and water, in the earth's crust, and in all forms of life. See more »

  • Potassium


    Potassium, a silvery-white, metallic chemical element. Chemically, it is classed as an alkali metal, along with sodium, lithium, rubidium, and cesium. See more »

  • Radium


    Radium, a highly radioactive, brilliant-white metallic element that is produced by the natural disintegration of another element, uranium. See more »

  • Silicon


    Silicon, a lustrous, grayish-black chemical element that has both metallic and nonmetallic properties. See more »

  • Silver


    Silver, a metallic chemical element. Like gold and platinum, silver is a precious metal because of its beauty and scarcity. See more »

  • Sodium


    Sodium, a soft, silvery white metallic element. Sodium is the sixth most abundant element on earth, but it is always found combined with other elements. See more »

  • Sulfur


    Sulfur, or Sulphur, a nonmetallic chemical element. It is relatively abundant and widely distributed in nature. See more »

  • Tantalum


    Tantalum, a bluish-gray metallic chemical element. When polished, tantalum is silvery-white, resembling platinum. See more »

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