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Question

The size of isoelectronic species — F , Ne and Na+ is affected by
(a) Nuclear charge (Z )
(b) Valence principal quantum number (n)
(c) Electron-electron interaction in the outer orbitals
(d) None of the factors because their size is the same.


Solution

The size of an isoelectronic species increases with a decrease in the nuclear charge (Z). For example, the order of the increasing nuclear charge of F , Ne, and Na+ is as follows:
F < Ne < Na+
Z 9 10 11
Therefore, the order of the increasing size of F , Ne and Na+ is as follows:
Na+ < Ne < F 

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