11th Class Chemistry Chemical Bonding and Molecular Structure

  • question_answer 37) Explain the formation of H^ molecule on the basis of valence bond theory.


    s-s overlapping (Formation of hydrogen molecule): Each hydrogen atom has one electron in 1s-orbital which is spherical. 1s-orbital of both the hydrogen atoms approach each other closely and when they reach a point of maximum attraction by the two nuclei, they overlap and form a sigma bond. The bond has two electrons which have opposite spins. The probability of finding these electrons is maximum in the region between the two nuclei on the molecular axis. The electron density of the bond is distributed symmetrically about the molecular axis.

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