Electron Gain Calculation: Determine Electron Affinity & Energy Changes

Calculate Electron Gain Energy

Enter the total energy of the neutral atom before gaining an electron.
Enter the total energy of the atom after gaining an electron (the anion).
Select the unit for your energy values (both inputs should use the same unit).

Understand and calculate the energy released or absorbed during electron gain. Our free online tool helps determine electron affinity, a key concept in chemistry for predicting atomic behavior and reaction energetics. Simplify complex chemical calculations with precision.

Formula:

Formula:

ΔE = Eanion - Eatom

Where:

  • ΔE is the Electron Gain Energy (the change in energy when an electron is added).
  • Eanion is the total energy of the formed anion (A-) after electron gain.
  • Eatom is the total energy of the neutral atom (A) before electron gain.

Note: Electron affinity (EA) is often defined as the energy released when an electron is added. Therefore, a negative ΔE indicates energy is released (exothermic process, corresponding to a positive EA value), while a positive ΔE indicates energy is absorbed (endothermic process, corresponding to a negative EA value).

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