As per pauling the radius of the isoelectronic ions in a gi…

Chemistry Classification of Elements and Periodicity Atomic and Ionic Radius Subjective Type

Published on: August 14, 2026

As per pauling the radius of the isoelectronic ions in a given crystal is inversely proportional to the effective nuclear charge, Z*.

Z* = Z – σ ; where σ represent the screening constant

Crystal structure of NaF is shown as below

Determine the radius of F – in pm in nearest possible integer.

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The correct answer is:

CHECK THE SOLUTION.

The screening constant Na + & F – are same

Na + : 1s 2 2s 2 2p 6 σ = 0.35 × 8 + 2 × 0.85 = 2.8 + 1.7 = 4.5

∴ = =

= = =

∴ =

+ = 2.35 Å

or r F

– + r F – = 2.35 Å

or = × 2.35 Å = 1.388 Å = 1.388 × 10 –10 m

or = 138.8 pm

139 pm

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