The size of isoelectronic species `- F^(-)`, Ne and `Na^(+)` is affected by

Options

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.

Explanation

( a) Nuclear charge. The radii of isoelectronic ions decrease with the increase in the magnitude of nuclear charge. The given isoelectronic species possess different nuclear charges and hence different sizes. Their size decreases in the order : `F^(-)( + 9) gtNe(+ 10) gt Na^(+) (+11)`.