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Explain electrogain enthalpy value of elements of 17^(th)group. |
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Answer» Solution : Electron gain enthalpy value of `17^(th)` group elements are very NEGATIVE. `{:("Element",F,Cl,Br,I,At),(Delta_(eg) H " kJ mol "^(-1),-328,-349,-325,-295,-279):}` Value of electron gain enthalpy of Cl is maximum negative. Remaining value of `e^(-)` gain enthalpy is decreases when atomic number increases. General electronic configuration of halogen elements are `ns^(2)np^(5)`they can acceft 1 electron and becomes stable LIKE noble gases `ns^(2)np^(6)`. So, its value of electron gain enthalpy is negative. NOTE: Electron gain enthalpy value of noble gases are more negative than elements of the group of 16, 17 which are situated right hand side of the noble gas. |
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