Which of the following represents correct order of increasing electron gain enthalpy with negative sign for the elements 0, S, F and Cl? [CBSE AIPMT 2010]
Which of the following represents correct order of increasing electron gain enthalpy with negative sign for the elements 0, S, F and Cl? [CBSE AIPMT 2010]
The correct option is B O< S< F< CI
Key Idea Electron cairn enthalpy, generally increases in a period trom left to right and decreases in a group on moving downwards However members of ill period have somewhat higher electron gain enthalpy as compared to the corresponding members of second period because of their small size.
0 and S belong to VI A (16) group and Cl and F belong to VII A (17) group Thus the electron enthalpy of Cl and F is higher as compared to 0 and S
Cl and F > O and S
Between Cl and F, has higher electron gain enthalpy then the F. since the incoming electron experiences a greater force of repulsion because of small size of F-atom. Similar is true in case of O and S, i.e. the electron gain enthalpy of S is higher as compared to O due to its small size. Thus, the correct order of electron gain enthalpy of given elements is O < S < F < Cl
O< S< F< CI
Key Idea Electron cairn enthalpy, generally increases in a period trom left to right and decreases in a group on moving downwards However members of ill period have somewhat higher electron gain enthalpy as compared to the corresponding members of second period because of their small size.
0 and S belong to VI A (16) group and Cl and F belong to VII A (17) group Thus the electron enthalpy of Cl and F is higher as compared to 0 and S
Cl and F > O and S
Between Cl and F, has higher electron gain enthalpy then the F. since the incoming electron experiences a greater force of repulsion because of small size of F-atom. Similar is true in case of O and S, i.e. the electron gain enthalpy of S is higher as compared to O due to its small size. Thus, the correct order of electron gain enthalpy of given elements is O < S < F < Cl
