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.


Plutonium, a radioactive, metallic chemical element. Although very small quantities of plutonium occur in nature in some uranium ores, virtually all plutonium in existence has been produced in nuclear reactors.

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  • Indium


    Indium, a rare chemical element. Indium is a soft, silvery-white metal, easy to melt and mold. See more »

  • Iridium


    Iridium, a hard, white, metallic element of the platinum family. It is found in mineral deposits with platinum and osmium. See more »

  • Krypton


    Krypton, a colorless, odorless, tasteless element. It is a noble, or inert, gas (one that ordinarily will not combine with other elements). See more »

  • Lawrencium


    Lawrencium, a radioactive, metallic chemical element. It does not occur in nature. See more »

  • Lithium


    Lithium, a silvery-white metallic chemical element. Lithium is the lightest metal and the third lightest of all elements. See more »

  • Magnesium


    Magnesium, a silvery metallic element. It is very light, weighing only two-thirds as much as aluminum. See more »

  • Manganese


    Manganese, a hard, brittle, gray-white metallic element. It is chemically active; it corrodes readily in air and is soluble in water and dilute acids. See more »

  • Mendelevium


    Mendelevium, a transuranium chemical element. All isotopes of mendelevium are radioactive. See more »

  • Mercury (element)

    Mercury (element)

    Mercury and its compounds are highly poisonous. They are released into the environment by such activities as the burning of fossil fuels and the use of certain pesticides, and by such natural processes as volcanic eruptions. See more »

  • Metal


    Metal, a member of the largest class of chemical elements in the Periodic Table. See more »

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