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Chemistry · Classification of Elements and Periodicity in Properties

हिन्दी

Why is the first ionization enthalpy of magnesium greater than that of aluminium?

  1. Due to the stability of fully filled \( 3s^2 \) orbitals in magnesium compared to the single \( 3p \) electron in aluminium.
  2. Due to smaller nuclear charge in aluminium than magnesium.
  3. Due to larger atomic radius of aluminium.
  4. Due to higher shielding effect in aluminium.

Correct answer · Option 1

Due to the stability of fully filled \( 3s^2 \) orbitals in magnesium compared to the single \( 3p \) electron in aluminium.

Explanation

Mg has stable fully filled \( 3s^2 \) configuration, requiring more energy to remove an electron than from Al (\( 3s^2 3p^1 \)).

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