Which one of the following will have the smallest radius?
Correct answer: B. Si3+
- A. Al3+
- B. Si3+
- C. Mg2+
- D. Na1+
Explanation
Silicon has the highest atomic number and Si3+ has the highest nuclear charge. Hence, it has the smallest radius. ion with the most protons will have the strongest pull on those electrons, resulting in the smallest radius. Silicon (Si³⁺) has the most protons (14), so it has the smallest radius.
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