CBSE · Class 11 · Chemistry · Classification of Elements and Periodicity in PropertiesWhich of the following species has the smallest size?
Step-by-Step Solution
Among $Na^+, Mg^{2+}, Al^{3+}, F^-$, all are isoelectronic (10 electrons). $Al^{3+}$ has the highest nuclear charge ($Z=13$), hence it pulls electrons closest and has the smallest radius.
Detailed Options Breakdown
Option : $Na^+$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Classification of Elements and Periodicity in Properties.
Option 1: $Mg^{2+}$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Classification of Elements and Periodicity in Properties.
Option 2: $Al^{3+}$ (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: $F^-$
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Classification of Elements and Periodicity in Properties.
💡 Study Guide: This question tests core syllabus concepts from Classification of Elements and Periodicity in Properties. For formulas, key summaries, and mock exam reference guides, read the full Classification of Elements and Periodicity in Properties Revision Notes.