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b). ₂₉Cu = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰
c). ₁₆S²⁻ = 1s² 2s² 2p⁶ 3s² 3p⁶ (karena jumlah elektronnya 16+2=18)