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2 năm trước
Hợp chất A tạo bởi ion M+ và ion X2 2-. Tổng số các hật cơ bản của A là 164, trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 52 hạt. Tổng số hạt mang điện của ion M+ hơn ion X2 2- là 3 hạt. Vị trí của m trong bản tuần hoàn?
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