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Cho các nguyên tố sau đây: Na, Cu, Al. Tìm nhận xét không đúng: A.Lớp vỏ ngoài cùng của Na và Cu có số electron bằng nhau. B.Nguyên tử Na có 3 lớp electron. C.Nguyên tử Al có 1 e ở phân lớp ngoài cùng. D.Lớp ngoài cùng của Cu và Al có số electron đều bằng 1.
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