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Characteristics of periods and groups of a periodic table

Characteristics of periods and groups of a periodic table

Characteristics of periods

1 –  Valence electrons. On moving from left to right in a period, the number of valence electrons increases from 1 to 8 (except first period where the increase is from one to two only).

  Na         Mg         Al          Si            P           S           Cl          Ar

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The Periodic Table

Elements can be grouped into classes according to the chemical compounds they form. If the elements are written in a table in order of increasing atomic weights, they fall naturally into a series of columns, with members of a given chemical group in the same column. This is called the periodic table of the elements.The term periodic means recurring at regular intervals. The original periodic tables were…

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