Question

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

• A. Principal quantum number (n)
• B. None of the factors because their size is the same
• C. Electron-electron interaction in the outer orbitals
• D. Nuclear charge (z)

Answer 1

Answer: (D)

Nuclear charge (z)

Answer 2

In $\text{F}^-$, Ne, and $\text{Na}^+$, all have $1s^2, 2s^2, 2p^6$ configuration. They differ in size due to differences in nuclear charge, affecting their pull on electrons.