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Per NCERT §3.7.1(b) (last paragraph), comparing F (64 pm) and F⁻ (136 pm), the F⁻ ion is more than twice as large because:
AF⁻ has more protons
BF⁻ has a smaller core
CF⁻ has higher Z_eff
DExtra electron adds e–e repulsion + decreases Z_eff while Z is unchanged — orbital expands
Answer & Solution
Correct answer: D. Extra electron adds e–e repulsion + decreases Z_eff while Z is unchanged — orbital expands
Per NCERT §3.7.1(b), F → F⁻ adds one e⁻ to 2p subshell. Repulsion ↑, Z_eff ↓ ⇒ F⁻ is much larger than F.
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