1. Tardigrade
  2. Question
  3. Chemistry
  4. Among the following pairs (1) Oxygen - Sulphur (2) Nitrogen - Phosphorus (3) Phosphorus - Arsenic (4) Chlorine - Iodine Those in which the first ionization energies differ by more than 300 kJ mole-1 are

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Among the following pairs
(1) Oxygen - Sulphur
(2) Nitrogen - Phosphorus
(3) Phosphorus - Arsenic
(4) Chlorine - Iodine
Those in which the first ionization energies differ by more than $300 kJ mole^{-1 }$ are

Classification of Elements and Periodicity in Properties

Solution:

Ionization energy decreases on moving down in a group and difference between I.E. of two successive members also decreases as we move from top to bottom in the same group. So difference of I.E. of $2^{nd}$ and $3^{rd}$ period element of same group is higher than that of $3^{rd}$ and $4^{th}$ period element. Hence, $1^{st} I.E.$ differ by more than $ 300 \,kj/mol $ for oxygen-sulphur and nitrogen-phosphorus pair.