Chemistry

Question Analysis
This question involves applying the isoelectronic ion radius trend to identify the largest ion in a given series.
The main focus is on linking nuclear charge to ionic size for species with the same number of electrons.

Key Concept Explanation
Isoelectronic ions have the same number of electrons but different nuclear charges.
Ionic radius decreases with increasing nuclear charge (number of protons) because a stronger positive charge pulls the electron cloud closer. For the 10-electron series, O²⁻ has the lowest nuclear charge (8 protons) and thus the largest radius.

Step-by-Step Solution
1. Confirm all ions are isoelectronic (10 electrons each).
2. List the nuclear...