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Itz vry simple..
like atomic numbr of oxygen is 8...
so itz electronic configuration will be.. 2, 6..
in this 2+6=8
also in the first shell..only 2 elctrons can be there..
n in the 2nd shell..the maximum elctrons it can hold is 8..
atomic nmbr of sodium is 11..
so itz electronic configuraton will be.. 2, 8 , 1..
i hope u understood..
hope it helpd..
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