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Golongan = 2+1 = IIIA
periode = 3
35B = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵
Golongan = 2 + 5 = VIIA
periode = 4
8R = 1s² 2s² 2p⁴
golongan = 2+4 = VIA
periode = 2
53X = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
golongan = 2+5 = VIIA
periode = 5