MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
Which cation is the smallest?
Think it through first, then pick an option.
- a Na⁺
- b K⁺
- c Mg²⁺
- d Al³⁺
Answer and explanation
Correct answer: d Al³⁺
Al³⁺: 13 protons on 10 electrons, the smallest.
Why the other options are wrong
- a Na⁺: Na⁺ has 11 protons, fewer than Al³⁺. The answer is Al³⁺.
- b K⁺: K⁺ has three levels, the largest. The answer is Al³⁺.
- c Mg²⁺: Mg²⁺ has 12 protons, fewer than Al³⁺. The answer is Al³⁺.
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