first 20 elements of the periodic table

By 4284
  • Hydrogen

    Hydrogen

  • Nitrogen

    Nitrogen

  • Oxygen

    Oxygen

  • Beryllium

    Beryllium

  • Sodium

    Sodium

  • Boron

    Boron

  • Lithium

    Lithium

  • Fluorine

    Fluorine

  • Helium

    Helium

  • Neon

    Neon

  • Carbon

    Carbon

    discovered in BC

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