The Ionisation enthalpy of which element is highest (a) F (b) F- ( c). cl. (d). cl-?

Question

Answer

Fluorine has highest ionization enthalpy

Answer

F- ion has highest ionisation enthalpy as it has the electronic configuration of inert gas. And to remove the electron from its outer shell Very high energy is required.

Answer

Cl- will have highest ionisation enthalpy as it has 8 electrons in its outermost shell.

Answer

What is ionic radius

Answer

Comparison of Ionisation Enthalpy
The ionisation enthalpy is the amount of energy required to remove an electron from an atom or ion in its gaseous state. When comparing the ionisation enthalpy of F, F-, Cl, and Cl-, several factors come into play, such as atomic size, effective nuclear charge, and electron-electron repulsions.
Ionisation Enthalpy of Elements
- Fluorine (F):
- Fluorine has a high ionisation enthalpy due to its small atomic size and high effective nuclear charge.
- It has a strong attraction between the nucleus and the valence electrons, making it difficult to remove an electron.
- Fluoride ion (F-):
- The ion F- has gained an electron, which results in increased electron-electron repulsion and a larger atomic radius.
- This makes it easier to remove an electron compared to neutral fluorine, leading to a lower ionisation enthalpy.
- Chlorine (Cl):
- Chlorine has a lower ionisation enthalpy than fluorine due to its larger atomic size and lower effective nuclear charge.
- The distance between the nucleus and the outermost electron is greater, making it easier to remove an electron.
- Chloride ion (Cl-):
- Similar to F-, Cl- also has increased electron-electron repulsion compared to neutral Cl.
- This results in even lower ionisation enthalpy compared to Cl.
Conclusion
Among the elements listed, fluorine (F) has the highest ionisation enthalpy.
- This is due to its small size and strong attraction between the nucleus and its electrons, making it the most difficult to ionise compared to F-, Cl, and Cl-.

Similar Class 11 Doubts

Among the following elements element with highest ionisation enthalpy is

Hydrogen has an ionisation energy of 1311 kJ mol–1 and for chlorine it is 1256 kJ mol–1.Hydrogen forms H+ (aq) ions but chlorine does not form Cl+ (aq) ions because [1996]

In the following question a statement of Assertion (

Which element has the highest ionization potential in the following element s? (

Which element has lowest ionisation enthalpy ?Give reason also.?

Top Courses for Class 11View all

Chemistry Class 11

CUET Mock Test: Humanities Subjects 2025

English Class 11

Mathematics (Maths) Class 11

Psychology Practice Tests: CUET Preparation

Top Courses for Class 11

Top Courses for Class 11

Suggested Free Tests

Related Content

Schools

Competitive Examinations

Quick Access Links

Technical Exams