The second ionization enthalpy of Mg is much lower than its first ionization enthalpy. Give reason.
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The second ionization enthalpy of Mg is much lower than its first ionization enthalpy. Give reason.
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The electronic configuration of ₁₂Mg is -
1s² 2s² 2p⁶ 3s²
₁₂Mg --------------------------> ₁₁Mg I.E₁
(stable) (1s² 2s² 2p⁶ 3s¹) <---- less stable
₁₁Mg -------------------------->₁₀Mg I.E₂
(less stable) (1s² 2s² 2p⁶) <---- stable
Here in the second ionization enthalpy we can see that Mg attains noble gas configuration hence stable. While in the first ionization enthalpy Mg turns less stable; comparative to the former I.E₂<< I.E₁.
Answer:
The electronic configuration of ₁₂Mg is -
1s² 2s² 2p⁶ 3s²
₁₂Mg --------------------------> ₁₁Mg I.E₁
(stable) (1s² 2s² 2p⁶ 3s¹) <---- less stable
₁₁Mg -------------------------->₁₀Mg I.E₂
(less stable) (1s² 2s² 2p⁶) <---- stable
Here in the second ionization enthalpy we can see that Mg attains noble gas configuration hence stable. While in the first ionization enthalpy Mg turns less stable; comparative to the former I.E₂<< I.E₁.