Question

The size of isoelectronic species — F^-, Ne and Na⁺ is affected by ______.

Options

• Nuclear charge (Z)

• Valence principal quantum number (n)

• Electron-electron interaction in the outer orbitals

• None of the factors because their size is the same.

Answer 1

Nuclear charge (Z)

Explanation:

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^–