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The Periodic Table - The Periodic Table As more and more...

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The Periodic Table As more and more elements were discovered and characterized, efforts were made to see whether they could be grouped , or classified, according to their chemical behavior. This effort resulted, in 1869, in the development of the Periodic Table . Certain elements show similar characteristics: Lithium (Li), Sodium (Na) and Potassium (K) are all soft, very reactive metals Helium (He), Neon (Ne) and Argon (Ar) are very non-reactive gasses If the elements are arranged in order of increasing atomic number, their chemical and physical properties are found to show a repeating, or periodic pattern. Note: This table lists the atomic number (number of protons) in the upper left corner of each box. The atomic number is formally placed as a subscript preceding the atom name. As an example of the periodic nature of the atoms (when arranged by atomic number), each of the soft reactive metals comes immediately after one of the nonreactive gasses.
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