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Help me understand! - When the first electron gain enthalpyof oxygen is -141kJ/mol , its second electron gain enthalpy i - Classification of Elements and Periodic table - JEE Main

When the first electron gain enthalpy \left ( \Delta _{eg}H \right ) of oxygen is -141kJ/mol , its second electron gain enthalpy is :

  • Option 1)

    A more  negative value than the first .

  • Option 2)

    Almost the same as that of the first .

  • Option 3)

    Negative , but less  negative than the first .

  • Option 4)

    A positive value .

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Electron gain enthalpy -

When an electron is added to a neutral gaseous atom (x) to convert it into a negative ion, the enthalpy change accompanying the process is defined as the electron gain enthalpy 
(\Delta_{eg}H^\circleddash )

- wherein

The second electron gain ethalpy is always positive for elements.

O^{-}(g)+e^{-}\rightarrow O^{-2}(g)

\Delta H\Rightarrow +ve

 

 

Variation of electron gain enthalpy with electronic configuration -

Elements with half or full filled orbitals are more stable.Energy is required to add an electron since they do not accept electron easily.

- wherein

\bigtriangleup _{eg}H^{-}  have high positive value.

 

 


Option 1)

A more  negative value than the first .

Option 2)

Almost the same as that of the first .

Option 3)

Negative , but less  negative than the first .

Option 4)

A positive value .

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