The ionization potentials of Li and K are 5.4 and 4.3 eV respectively. The ionization potential of N — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: Analyze the group trend for ionization potential (I.P.) in Group 1 (alkali metals). Moving down the group, ionization potential decreases as atomic size increases (Li > Na > K). Step 2: Since Sodium (Na) is positioned between Lithium (Li) and Potassium (K), its ionization potential must lie between that of Li (5.4 eV) and K (4.3 eV). Step 3: Among the given choices, only 4.9 eV falls within this range. Therefore, the correct answer is (c).