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.



Radon, a radioactive, colorless, odorless, gaseous element. Radon is the heaviest known gas and is inert (will not normally combine with any other element).

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  • Hafnium

    Hafnium, a chemical element. It is a silvery metal, usually found in minerals in combination with the element zirconium. See more »

  • 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 »

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