Answer:
The number of electrons, neutrons in\[{{A}^{+1}}\]are 10, 12 respectively. Therefore the atomic number (Z) = 11 and mass number = 23. The number of electrons, neutrons in\[{{D}^{+2}}\]are 10, 12 respectively. Therefore the atomic number (Z) = 12 and mass number = 24. The number of electrons, neutrons in\[{{C}^{+3}}\]are 10, 14 respectively. Therefore the atomic number (Z) = 13 and mass number = 27.
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