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16 S : periode ke 3
33 As periode ke 4
₁₆S = 1s² 2s² 2p⁶ 3s² 3p⁴ = [Ne]3s² 3p⁴ (Peride 3)
₃₃As = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹° 4p³ = [Ar]4s² 3d¹° 4p³ (periode 4)