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NTA Abhyas NEET2020ChemistryClassification of Elements and Periodicity in PropertiesPractice

The first ionisation energies of magnesium and aluminium are respectively given by

Options

  1. A7.64, 5.98
  2. B7.64, 7.64
  3. C5.98, 7.64
  4. D5.98, 5.98

Correct answer

A. 7.64, 5.98

Step-by-step solution

I E of M g > I E of A l Electronic configuration of Mg = 1 s 2 , 2 s 2 , 2 p 2 , 3 s 2 Al = 1 s 2 , 2 s 2 , 2 p 6 , 3 s 2 , 3 p 1 M g has stable configuration (fulfilled) than A l so removal of an electron is difficult hence, required more energy i.e. more ionisation energy.

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