MCQ
Among halogens, the correct order of amount of energy released in electron gain $($electron gain enthalpy$)$ is :
- A$\ce{F > Cl > Br > I}$
- B$\ce{F < Cl < Br < I}$
- ✓$\ce{F < Cl > Br > I}$
- D$\ce{F < Cl < Br < I}$
✓
Answer
Correct option: C.
$\ce{F < Cl > Br > I}$
Within a group, electron gain enthaply becomes less negative down a group.
However, adding an electron to the $2p\ -$ orbital leads to greater repulsion than adding an electron to the larger $3p\ -$ orvital.
Hence, the element with most negative electron gain enthalpy is chlorine.
However, adding an electron to the $2p\ -$ orbital leads to greater repulsion than adding an electron to the larger $3p\ -$ orvital.
Hence, the element with most negative electron gain enthalpy is chlorine.
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