Chemistry Chemical Bonding MDCAT 2018
PMDC Verified Question 88 of 102
Electron affinity of the atom is the energy released when:
A
Electron is added to gaseous atom
B
Electron is removed from gaseous atom
C
Covalent bond of molecule is broken
D
Cov. bond is formed between the atoms
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Electron is added to gaseous atom
Concept:

Electron affinity (EA) is defined thermodynamically as the change in energy associated with the addition of an electron to a neutral gaseous atom.

Formula:

$$ X_{(g)} + e^- \longrightarrow X^-_{(g)} \quad \Delta H = \text{-EA} $$

Solution:

  • When a non-metal gaseous atom attracts and captures a free electron, it becomes a negatively charged anion.


  • Because the incoming electron falls into the attractive field of the nucleus, energy is usually released (exothermic process).


Why other options are incorrect:

  • Option B: Defines Ionization Energy.
  • Option C: Defines Bond Dissociation Energy.
  • Option D: Defines Bond Formation Energy.

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