Arrange the following isoelectronic species (O^(2-) , F^(-) , Na^+, Mg^(2+)) in order of: increasing ionization energy

Arrange the following isoelectronic species (O^(2-) , F^(-) , Na^+, Mg

1.	Arrange the following isoelectronic species (O^(2-) , F^(-) , Na^+, Mg^(2+)) in order of: increasing ionization energy
Answer» Solution :`O^2 lt F lt Na^+ lt MG^(2+)`. As dictated above, greater the POSITIVE charge, smaller the size of the cation and hence closer the valence electrons to the nucleus. Increased effective nuclear charge results in the valence electrons being tightly BOUND to the nucleus CAUSING the ionization ENERGY to increase