The ionic radii of Li+, Be2+ and B3+ follow the order : — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: Note that Li+, Be2+, and B3+ are isoelectronic species, each possessing exactly 2 electrons. Step 2: For isoelectronic species, the ionic radius decreases as the atomic number (nuclear charge) increases, because a stronger nucleus pulls the same number of electrons more tightly. Step 3: The atomic numbers are Li (3), Be (4), and B (5). Therefore, the size order is Li+ > Be2+ > B3+, matching option (d).