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Willian
Um íon que tenha 9 prótons, 10 nêutrons e 10 elétrons é representado por:
(A) 19Cl2−^{19}Cl^{2-}19Cl2−
B 19F2−^{19}F^{2-}19F2−
C 19F−^{19}F^-19F−
D) 19Cl^{19}Cl19Cl
E 19Cl−^{19}Cl^-19Cl−
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