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Verified answer
konfigurasi elektron :(1) ₄₅X : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d⁷
(2) ₆₃Y : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁷
(3) ₁₇Z : 1s² 2s² 2p⁶ 3s² 3p⁵
diagram orbital lihat pada gambar yaa.. :)