Which ion among the following has the highest effective nuclear charge for an isoelectronic series with 10 electrons?
For isoelectronic species (10 electrons), effective nuclear charge increases with atomic number. Al³⁺ (Z=13) has the highest effective nuclear charge compared to Na+, Mg²⁺, or F⁻.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100