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- Electron affinity depends on:Option: 1 Atomic numberOption: 2 Atomic si
- #Classification of Elements and Periodic table
- #Joint Entrance Examination Main
- #National Eligilibility Cum Entrance Test
- #Engineering
- #Chemistry
Electron affinity depends on:
Atomic number
Atomic size
Nuclear charge
Both atomic size and nuclear charge
Answers (1)
Electron Gain Enthalpy or Electron Affinity -
Electron Affinity
Electron gain enthalpy is the energy change that occurs when an electron is added to a neutral gaseous atom to form a negative ion. It is also known as electron affinity.
A(g) + e →A-(g) + egH
Factors affecting electron affinity
The electron gain enthalpy or electron affinity depends upon various factors such as:
-
Atomic Size
With the increase of atomic size, the distance between the nucleus and the last shell electrons also increases due to which the force of attraction between the nucleus and the incoming electron decreases. Hence, the electron gain enthalpy becomes less negative.
-
Nuclear Charge
With the increase of nuclear charge, the force of attraction between the nucleus and the incoming electron increases. Thus, the electron gain enthalpy becomes more negative.
The electron affinity of any element depends upon the atomic size and the nuclear charge. More the size of the atom, lesser is the electron affinity and higher the nuclear charge, higher is the electron affinity.
Therefore, Option(4) is correct
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