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

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
Electron affinity depends on
  • A
    Atomic size
  • B
    Nuclear charge
  • C
    Atomic number
  • ✓
    Atomic size and nuclear charge both
✓

Answer

Correct option: D.
Atomic size and nuclear charge both
d
Electron affinity is the amount of energy released when an electron is added to a neutral atom to form a negative ion. $EA$ decreases on moving down the group as the atomic size increases and net nuclear charge increase is offset by extra screening electrons as the additional electron enters an orbital away from the nucleus. So, it is less attracted to nucleus and would release less energy when added.

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