0

Guest

Courses New

electron gain enthalpy increases from F to Cl but then decreases . so can we say the more electron repulsion the less electron gain enthalpy and the less electron repulsion the more the electrongain enthalpy . what about bromine and Iodine , does the electron gain enthalpy decrease due to the presence of a d-orbital ?

electron gain enthalpy increases from F to Cl but then decreases . so can we say the more electron repulsion the less electron gain enthalpy and the less electron repulsion the more the electrongain enthalpy . what about bromine and Iodine , does the electron gain enthalpy decrease due to the presence of a d-orbital ?

Grade:

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
8 years ago
on moving down the group the atomic size as well as nuclear charge inreases.But the effect of increase in atomic size is much more pronounced than that of nuclear charge and thus the additional electrons feels less attraction consequently electron gain enthalpy becomes less negative on going down the group
X (g) + e- ===> X- (g)
F = -328 kJ/mol
Cl = -349 kJ/mol
Br = -325 kJ/mol
I = -295 kJ/mol
However the electron gain enthalpy of F is less negative than of Cl because of its small size. The additional electron in case of F will be added to the 2p orbital while in case of Cl it will go in the 3p orbital. As a 2p orbital occupies a smaller region of space than 3p orbital, it will be more compact because of which electron-electron repulsions would be more. Therefore the incoming electron would be accepted with much less ease in case of F. Hence its electron gain enthalpy is less negative than Cl.

Think You Can Provide A Better Answer ?

Other Related Questions on Inorganic Chemistry

View all Questions »

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More