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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  • Metal

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

  • Molybdenum

    Molybdenum, a hard, silvery, metallic element. It is insoluble in most acids, and does not react with air at ordinary temperatures. See more »

  • Neptunium

    Neptunium, a radioactive, metallic chemical element. Neptunium metal is silver-white. See more »

  • Nickel

    Nickel, a silver-white, metallic, chemical element. Nickel is the third most magnetic element, exceeded in this quality only by iron and cobalt. See more »

  • Niobium

    Niobium, a lustrous, silver-white, metallic chemical element. Until 1950, when the name niobium was officially adopted by the International Union of Pure and Applied Chemistry, the metal was also known as columbium in the United States. See more »

  • Nobelium

    Nobelium, a radioactive, metallic chemical element. Nobelium does not occur in nature; it is produced artificially in trace amounts in cyclotrons and linear accelerators. See more »

  • Osmium

    Osmium, a hard, bluish-white metallic chemical element. Osmium is one of the heaviest elements known; it is twice as heavy as lead and 22 times as heavy as water. See more »

  • Phosphorus

    Phosphorus, a nonmetallic chemical element. It is an abundant element and in nature is always found combined with other elements. See more »

  • Platinum

    Platinum, a silvery-white, metallic chemical element. Platinum and five other elements—osmium, iridium, paladium, rhodium, and ruthenium—make up the platinum group of metals. See more »

  • Plutonium

    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. See more »

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