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2. ₂₆ Fe⁺³ = 1s² 2s² 2p⁶ 3s2 3p⁶ 4s² 3d³
3. ₄₇ Ag = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁹
4. ₅₈ Cb = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f²
5. ₄₂ Pb = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁴