The radii of , , and are in the order of

Question

The radii of , ,  and  are in the order of

Canvas Classes · Accepted Answer

Strategy:
 Rank species by considering both their nuclear charge () and their electronic state (neutral vs. anionic). For isoelectronic species, size .

Step 1: Compare isoelectronic ions
-  (, 10e⁻) vs  (, 10e⁻).
- A lower nuclear charge () allows the electron cloud to expand more. Thus, .

Step 2: Compare neutral atoms
-  (, 8e⁻) vs  (, 9e⁻).
- Across a period, size decreases. Thus, .

Step 3: Compare ions with parent atoms
- Anions are larger than their parent atoms due to increased electron-

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