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baouyen031
2 năm trước
chọn đáp án đúng Z=29 A: X thuộc ô thứ 29, chu kì 4, phân nhóm IB 1s22s22p63s23p63d104s1 B: X thuộc ô 29, chu kì 3, nhóm IIB.1s22s22p63s23p63d94s2
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