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Synqbnq
2 năm trước
Ba nguyên tử cùng loại của nguyên tố R có khối lượng bằng khối lượng của 6 nguyên tử Cacbon. Tính nguyên tử khối, cho biết tên, kí hiệu của nguyên tố R ? (Cho nguyên tử khối của Cacbon là 12 đvC)
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