It is incorrect to write the structural formula of the H2S molecule as H-H-S because it does not accurately represent the bonding in the molecule. In H2S, there is a covalent bond between the hydrogen and sulfur atoms, not two separate hydrogen-hydrogen bonds and a hydrogen-sulfur bond as implied by H-H-S. The correct structural formula for H2S is H-S-H, representing the single covalent bond between the hydrogen and sulfur atoms.
