How many protons, electrons, and neutrons are in an ²⁵ Mg ²⁺ ion? A) 12 protons, 12 electrons, and 13 neutrons B) 12 protons, 10 electrons, and 12 neutrons C) 13 protons, 10 electrons, and 12 neutrons D) 12 protons, 10 electrons, and 13 neutrons E) 12 protons, 14 electrons, and 13 neutrons

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The atomic number of magnesium (Mg) is 12, so it has 12 protons. The mass number is 25, so it has 25 - 12 = 13 neutrons. As a 2+ ion, it has lost 2 electrons, leaving it with 10 electrons.

How Many Protons, Electrons, and Neutrons Are in an