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Q76 (NDA-I/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

If x is the number of electrons and y is the number of nucleons present in 32S2-, then which one of the following is correct?

Explanation

Sulfur (S) has an atomic number of 16, meaning a neutral sulfur atom contains 16 protons and 16 electrons. The species 32S2- is a sulfide ion with a 2- charge, which indicates that the atom has gained 2 additional electrons. Therefore, the total number of electrons x = 16 + 2 = 18.

The number of nucleons represents the mass number (the sum of protons and neutrons in the nucleus). For the isotope 32S, the mass number is explicitly given as 32. Therefore, the number of nucleons y = 32.

Combining these results, x = 18 and y = 32, making option C the correct choice.

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