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The periodic table is a table in which all of the known elements are listed. The table arranges the elements in order of increasing proton number to show the similarities of chemical elements. Therefore elements with structural similarities & atomic number are placed together. These elements can be placed into two different categories, metals & non-metals. These elements can then be sub divided into 4 groups; Alkali, non-metals, transition & inner-transitions. If read horizontally the size of the atoms increases from metals to non-metals, yet when read vertically, all of the elements in the same group have the same number of electrons, which means they all behave in the same manner.
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