In case of isoelectronic species the size of F, Ne and Na is affected by:

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Strategy:
 Isoelectronic species have the same number of electrons. Their size is primarily determined by the nuclear charge (); a higher number of protons pulls the same number of electrons closer to the nucleus.

Step 1: Compare species
-  (),  (),  ().
- All possess exactly 10 electrons.

Step 2: Analyze the effect of Z
As the atomic number () increases, the effective nuclear charge increases, which results in a stronger attraction to the electrons and a smaller ionic/atomic size.
Order: .

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