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  1. periodic table - Encyclopedia Britannica

    • The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oga… See more

    History of the periodic law

    The early years of the 19th century witnessed a rapid development in analytical chemistry—the … See more

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    Classification of the elements

    In 1864, J.A.R. Newlands proposed classifying the elements in the order of increasing atomic weights, the elements being assigned ordinal numbers from unity upward an… See more

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  2. Interactive Periodic Table of the Elements

    This is an interactive periodic table of the elements showing their atomic weights, atomic numbers, electron configurations, and state at room temperature.

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  3. Periodic table - Elements, Groups, Blocks | Britannica

    5 days ago · The periodic table of the elements contains all of the chemical elements that have been discovered or made; they are arranged, in the order of their atomic numbers, in seven horizontal periods, with the lanthanoids …

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    Periodic Groups
    Earliest Periodic Table of Elements
  4. Periodic Table of the Elements - Encyclopedia Britannica

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  5. periodic table - Students | Britannica Kids | Homework Help

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  6. periodic table - Kids | Britannica Kids | Homework Help

    The periodic table arranges the elements in rows and columns. In the rows, the elements are placed in order of their atomic number. The columns form groups of elements that have similar chemical properties.

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  7. periodic table - Students | Britannica Kids | Homework Help

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  8. list of chemical elements - Encyclopedia Britannica

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  9. Periodic Table of Elements - Encyclopedia.com

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  10. chemical element - Students | Britannica Kids | Homework Help

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