Question

Highest electron affinity among the following is

• A. fluorine
• B. chlorine
• C. sulphur
• D. $Xe$

Answer 1

Answer: (B)

Highest electron affinity among fluorine, chlorine, sulphur and oxygen is o f chlorine
Electron affinities (E.A.) of various elements are
Electron affinity of $F=332.6kJ/mol$
Electron affinity of $Cl=348.5kJ/mol$
Electron affinity of $S=200.7kJ/mol$
Electron affinity of $O=140.9kJ/mol$
The low value o f electron affinity of fluorine is probably due to small size of fluorine atom, i.e., electron density is high which hinders the addition of an extra electron