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nguyên tử A có tổng hợp số hạt nơtron, electron, proton là 21 trong đó số hạt không mang điện bằng số hạt mang điện. tìm số hạt mỗi loại
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nguyên tử A có tổng hợp số hạt nơtron, electron, proton là 21 trong đó số hạt không mang điện bằng s...
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