Trắc nghiệm: (1) 1s22s22p1. (2) 1s22s22p6(3) 1s22s22p4. (4) 1s22s22p63s1(5) 1s22s22p63s23p6,(1) 1s22s22p1. (2) 1s22s22p6(3) 1s22s22p4. (4) 1s22s22p63s1(5) 1s22s22p63s23p6 | Gửi trắc nghiệm |
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Trắc nghiệm: (1) 1s22s22p1. (2) 1s22s22p6(3) 1s22s22p4. (4) 1s22s22p63s1(5) 1s22s22p63s23p6,(1) 1s22s22p1. (2) 1s22s22p6(3) 1s22s22p4. (4) 1s22s22p63s1(5) 1s22s22p63s23p6 | Gửi trắc nghiệm |