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periode = 2
golongan = 4A
b 1s^2 2s^2 2p^4
periode = 2
golongan = 6A
c 1s^2 2s^2 2p^6 3s^1
periode = 3
golongan = 7A
Periode 2
Golongan 14
Periode 2
Golongan 16
Periode 3
Golongan 1