Correct Answer: S²⁻ ; Anion
Subject: chemistry
Explanation: • <b>Key Fact</b> The number of protons defines the element. Atomic number 16 is Sulfur (S). • <b>Supporting Detail</b> A neutral sulfur atom has 16 protons and 16 electrons. Since this species has 18 electrons, it has gained 2 extra electrons. • <b>Related Concept</b> Gaining electrons results in a negatively charged ion called an Anion (charge = -2, S²⁻). • <b>Why wrong options are wrong</b> Option B is Argon (18 protons). Option C (S²⁺) has 14 electrons. Option D is Chloride (17 protons). • <b>Exam Trick</b> Protons > Electrons = Positive Cation. Electrons > Protons = Negative Anion. • <b>Additional Info</b> The mass number of this isotope is 16(p) + 16(n) = 32.
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