How to find group and period using shell elctronic configuration?
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the number of cells in the electronic configuration denotes the period the valency denotes the group
group number can be determined by the valency if the valency is one and 2 then the group number is 1, 2 respectively .
if the valency is above three then group number can be found by adding 10 to it.
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The number of shells in the electronic configuration of the given element determine it's period i.e. if there are 3 shells in an atom then it will belong to period 3.
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