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Define electron gain enthalpy or electro...

Define electron gain enthalpy or electron affinity. How does it vary along the period and down the group ?

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Electron gain enthalpy or electron affinity is defined as the amount of energy change when an electron is added to a neutral isolated gaseous atom to form a negatively charged ion is called electron gain enthalpy. For example,
Atom `(g)+e^(-)to` Negative ion(g) + Electron gain enthalpy.
Generally, electron gain enthalpy increases along the period and decreases down the group.
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Knowledge Check

  • Electron gain enthalpy of noble gases is :

    A
    Negative
    B
    Positive
    C
    Zero
    D
    Zero or Positive.

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