... 1s22s22p63s2 X2: 1s22s22p63s23p64s1 X3: 1s22s22p63s23p64s2 X4: 1s22s22p63s23p5 X5: 1s22s22p63s23p63d64s2 X6: 1s22s22p63s23p1 Các nguyên tố thuộc chu kỳ A X1, X4, X6 B X2, X3, X5 C X3, X4 D X1, X2, X6 E ... Klechkowski D A, B E A, C Câu 12: Cho 26 Fe, cấu hình electron Fe2+ là: A 1s22s22p63s23p64s23d4 B 1s22s22p63s23p64s23d4 C 1s22s22p63s23p63d6 D 1s22s22p63s23p64s24p4 E Tất sai Câu 13: 40 Cho diện ... + 2HCl = CuCl2 + H2O CuO + CO = Cu + CO2 Zn2+ + Cu = Zn + Cu2+ Fe + 2HCl = FeCl2 + H2 H2S + 2NaOH = Na2S + 2H2O 2KMnO4 to K2MnO4 + MnO2 + O2 BaCl2 + H2SO4 BaSO4 + 2HCl 2NO2 + 2NaOH NaNO2...