The H2S bond angle has been experimentally measured to be close to 90 degree (not 109.5 degree). How can the 90 degree bond angle be better explained using hydrogen's 1st and sulfur's 3p atomic oribitals than with hybrid oribitals? I want a good simple answer, thanks.

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Stereochemistry and Isomerism

Stereochemistry deals with the three-dimensional structure and properties of molecules. It explains the arrangement of atoms and their manipulation within a molecule in a 3D structure. Stereochemistry can be dealt with all types of molecules. Based on the stereochemistry of a molecule, the physical and chemical properties of the molecules vary.