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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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