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11th Class Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank 11th CBSE Chemistry Classification of Elements and Periodicity in Properties

  • question_answer
    Why is \[{{\Delta }_{i}}{{H}_{1}}\] of Mg more than that of Al?

    Answer:

                    The \[{{\Delta }_{i}}{{H}_{1}}\] of Al is expected to be more than that of Mg because of smaller size and greater nuclear charge. But actually it is less since the electronic configuration of Mg is more symmetrical than that of Al. For details, consult Section 3.15.


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