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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The correct order of electron affinity is
  • A
    $O> F > Cl$
  • B
    $F > O > Cl$
  • C
    $F > Cl > O$
  • ✓
    $Cl> F > O$
✓

Answer

Correct option: D.
$Cl> F > O$
d
On moving from left to right across a period, the electron affinity becomes more negative. On moving from top to bottom in a group, the electron affinity becomes less negative. Chlorine has more negative electron affinity than fluorine, Because adding an electron to fluorine ($2p$ orbital) causes greater repulsion than adding an electron to chlorine ($3p$ orbital) which is larger in size

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