If x is the number of electrons and y is the number of nucleons present in ^{32}_{16}\text{S}^{2-}, then which one of the following is correct?
- A. x = 14 \text{ and } y = 32
- B. x = 16 \text{ and } y = 30
- C. x = 18 \text{ and } y = 32 ✓
- D. x = 18 \text{ and } y = 30
Correct Answer: C. x = 18 \text{ and } y = 32
Explanation
The atomic number of Sulfur (S) is 16, so the neutral atom has 16 electrons. The S^{2-} ion has gained 2 electrons, bringing the total to x = 18. The mass number is 32, meaning there are y = 32 nucleons.
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