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Hello students in this question we have been given different groups from the periodic table and we have to tell the number of valence electrons for each.
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The first is second a group or the group two.
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The group two elements are beryllium, magnesium, calcium and so on.
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Their outer electronic configuration is ns2.
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Hence, the valence is valence.
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Of the elements in this group is 2.
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In the next case, we have been given group 4a or the 14th group.
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14th group contains elements like carbon, silicon, germanium, etc.
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Their outer configuration is ns2, np2, and the valency for the elements in this group is 4...