Paper: CSIR-NET June 2013 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Marks: 2 · Difficulty: Easy
Which of the following pairs has the highest difference in their first ionization energy?
(a)Xe, Cs
(b)Kr, Rb
(c)Ar, K
(d)Ne, Na
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Ne (2081) − Na (496) = 1585 kJ mol⁻¹, the largest drop; the gap shrinks down the groups (Ar/K 1103, Kr/Rb 948, Xe/Cs 795).