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umihikari
2 năm trước
1 xác định số mol nguyên tử và số lượng nguyên tử,phân tử có trong 16g lưu huỳnh 2 al có 13p,13e,14n. hỏi khối lượng các electron chiếm bao nhiêu % khối lượng nguyên tử
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