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begin{tabular}{lccccccc} Symbol & 7 Z & mass = & Number of p & Number of e & Number of n & Charge 2 hline

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\begin{tabular}{lccccccc} Symbol & 7 Z & mass = & Number of p & Number of e & Number of n & Charge 2 \\ \hline Ca2+ & 20 & & & & 20 & 2+2+ \\ \hline Mg2+ & & 25 & & & 13 & \\ \hline N3 & & 14 & & 10 & & \\ \hline \end{tabular}

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