what is meant by periodic classification
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A period in the periodic table is one of the horizontal rows. All of those elements in the row have the same number of electron shells. Going across a period, each element has one more proton and is less metallic than its predecessor. Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law. For example, the alkali metals lie in the first column (group 1) and share similar properties, such as high reactivity and the tendency to lose one electron to arrive at a noble-gas electronic configuration
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periodic classification is the arrangement of things according to their basis(characteristics).it can be of elements and tables etc.
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