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\begin{array}{|c|c|c|}\hline \text{Chất}&\text{Nguyên tử khối}\\\hline \text{Ca}&\text{40}\\\hline \text{Zn}&\text{65}\\\hline \text{Mg}&\text{24}\\\hline \text{Na}&\text{23}\\\hline Br&\text{80}\\\hline\end{array}
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