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1S2 2S2 2P6 3S2 3P4
Nomor atom 17
1S2 2S2 2P6 3S2 3P5
Nomor atom 18
1S2 2S2 2P6 3S2 3P6
Nomor atom 19
1S2 2S2 2P6 3S2 3P6 4S1
Nomor atom 20
1S2 2S2 2P6 3S2 3P6 4S2