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In 1913, the British scientist Moselle used cathode rays to hit metals to produce The arrangement of positive charges (i.e. number of protons or atomic number) took years of revision to become the contemporary periodic table.
In the periodic table, elements are arranged by their atomic number, with the smallest ones listed first. A horizontal row in the table is called a period, and a column is called a family.
Special Topic on Periodic Table of Elements
Special Topic on Table of Chemical Elements
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Periodic Table of Elements 2.01
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