Periodic TableEasy
Question
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign of the elements O, S, F and Cl ?
Options
A.Cl < F < O < S
B.O < S < F < Cl
C.F < S < O < Cl
D.S < O < Cl < F
Solution
Electron gain enthalpy, generally, increases in a period from left to right and decreases in a group on moving downwards. However, members of III period have somewhat higher electron gain enthalpy as compared to the corresponding members of second period, because of their small size.
O and S belong to VI A (16) group and Cl and F belong to VII A (17) group. Thus, the electron gain enthalpy of Cl and F is higher as compared to O and S.
Cl and F > O and S
Between Cl and F, Cl has higher electron gain enthalpy as in F, 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 ie, 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 and S belong to VI A (16) group and Cl and F belong to VII A (17) group. Thus, the electron gain enthalpy of Cl and F is higher as compared to O and S.
Cl and F > O and S
Between Cl and F, Cl has higher electron gain enthalpy as in F, 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 ie, 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
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