Write the electronic configuration Li,Be,C,O,Na,Mg,Al and mention which period these element belongs in Modern Periodic table
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Li=2,1 second period
Be=2,2 second period
C=2,4 second period
O=2,6 second period
Na=2, 8, 1 third period
Mg=2, 8,2 third period
Al=2, 8,3 third period
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