
Which element has the highest negative electron gain enthalpy value?
Answer
161.1k+ views
Hint: Electron gain enthalpy defines the amount of released energy on adding an electron to a gaseous isolated atom. On the basis of energy absorbed or released, the value of electron gain enthalpy can be positive or negative.
Complete Step by Step Solution:
In the periodic table, an element's position decides its electron gain enthalpy. On moving across a period, the count of electrons increases but the count of shells remains the same. So, there is an increase in nuclear size. This results in the increase of electron gain enthalpy across a period.
Along a group, on moving down we find the increase in the number of electrons because of the increase in the count of shells that ultimately results in the atomic size increase. Therefore, we see a decrease of electron gain enthalpy.
So, the 17th group elements have the higher electron gain enthalpy among all the elements. Let's find out which halogen has the highest negative electron gain enthalpy. From the above discussion, the order of electron gain enthalpy is, Fluorine > Chlorine > Bromine > Iodine.
But, the above order is not correct because of the smaller size of fluorine. Therefore, its electron gain enthalpy is less than chlorine. So, the order of halogens is Cl>F>Br>I
Hence, chlorine has the highest electron gain enthalpy.
Note: It is to be noted that students might get confused between fluorine and chlorine while deciding the highest electron gain enthalpy. Fluorine due to its small size possesses less electron gain enthalpy than chlorine.
Complete Step by Step Solution:
In the periodic table, an element's position decides its electron gain enthalpy. On moving across a period, the count of electrons increases but the count of shells remains the same. So, there is an increase in nuclear size. This results in the increase of electron gain enthalpy across a period.
Along a group, on moving down we find the increase in the number of electrons because of the increase in the count of shells that ultimately results in the atomic size increase. Therefore, we see a decrease of electron gain enthalpy.
So, the 17th group elements have the higher electron gain enthalpy among all the elements. Let's find out which halogen has the highest negative electron gain enthalpy. From the above discussion, the order of electron gain enthalpy is, Fluorine > Chlorine > Bromine > Iodine.
But, the above order is not correct because of the smaller size of fluorine. Therefore, its electron gain enthalpy is less than chlorine. So, the order of halogens is Cl>F>Br>I
Hence, chlorine has the highest electron gain enthalpy.
Note: It is to be noted that students might get confused between fluorine and chlorine while deciding the highest electron gain enthalpy. Fluorine due to its small size possesses less electron gain enthalpy than chlorine.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Main Mock Test Series Class 12 Chemistry for FREE

Classification of Drugs Based on Pharmacological Effect, Drug Action

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

JEE Energetics Important Concepts and Tips for Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

Displacement-Time Graph and Velocity-Time Graph for JEE

Degree of Dissociation and Its Formula With Solved Example for JEE

Free Radical Substitution Mechanism of Alkanes for JEE Main 2025

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 12 Chemistry Chapter 1 Solutions

JEE Advanced 2025: Dates, Registration, Syllabus, Eligibility Criteria and More

NCERT Solutions for Class 12 Chemistry Chapter 2 Electrochemistry

NCERT Solutions for Class 12 Chemistry Chapter 6 Haloalkanes and Haloarenes

Solutions Class 12 Notes: CBSE Chemistry Chapter 1
