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VuongThao
2 năm trước
:Nguyên tử của một nguyên tố X có tổng số hạt trong nguyên tử là 18, trong đó số hạt không mang điện bằng số hạt mang điện âm. Xác định số lượng mỗi loại hạt trong nguyên tử.
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