From the periodic table,the number of valence electrons for most of the main group elements may be determined directly from the

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The group number on the periodic table indicates the number of valence electrons for the elements in that group. For example, all the elements in Group 1 (also known as the Alkali Metals) have 1 valence electron, while all the elements in Group 18 (also known as the Noble Gases) have 8 valence electrons (except for helium which has 2). Therefore, the group number is the most direct way to determine the number of valence electrons for most of the main group elements.

From the Periodic Table,the Number of Valence Electrons for Most