Difficulty: Medium
Average Score: 79%
Practice
A species with 12 protons and 10 electrons is
Correct answer
C
Rationale
The correct answer is C: Mg2+. A species with 12 protons must have an atomic number of 12, which corresponds to magnesium (Mg). The 10 electrons indicate that it has a 2+ charge, making it Mg2+. Choice A (Ne2+) is incorrect because neon (Ne) has an atomic number of 10, not 12. Choice B (Ti2+) is incorrect because titanium (Ti) has an atomic number of 22, not 12. Choice D (Ne2ÔÇô) is incorrect because it suggests a negatively charged neon species, which is not possible with 10 electrons.