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.

Answer 1

Answer: (A)

Nuclear charge (Z )

Answer 2

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