11th Class Chemistry Chemical Bonding and Molecular Structure Question Bank 11th CBSE Chemistry Chemical Bonding and Molecular Structure

  • question_answer A molecule of \[{{H}_{2}}\] exists while that of the\[H{{e}_{2}}\]  does not. Explain.

    Answer:

                    Hydrogen atom (Z = 1) has only one electron present in the s-orbital\[(1{{s}^{1}})\]. The two such half filled atomic orbitals combine to form a molecular orbital which contains both these electrons. But helium (Z = 2) has already a filled orbital \[(1{{s}^{2}})\]. Therefore, the atomic orbitals of the helium atoms do not combine. Thus, a molecule of\[{{H}_{2}}\] exists while that of  \[H{{e}_{2}}\] does not.


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