For all neutral atoms, the number of valence electrons is equal to the group number in which the atom belongs and this can be found in the periodic table.
Group 1 has 1 valence electron. Group 2 has 2 valence electrons and so on.
Valence electrons are those electrons in the outermost principal quantum level (highest n level) of an atom in its ground state. Groups 1A to 8A have from 1 to 8 valence electrons. For each group of the representative elements (1A–8A), give the number of valence electrons, the general valence electron configuration, a sample element in that group, and the specific valence electron configuration for that element.
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