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There are two factors determining acidity of a compound, the electronegativity factor and the size factor. Down the period, the size factor dominates, and the reason $\ce{HI}$ is more acidic than $\ce{HF}$ is because of this factor, as in the former molecule, the orbitals of iodide participating in bonding are larger and more diffuse, hence bond is weaker. ...


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TL;DR: "Hydrogen persulfide" is technically a very crude mixture of various hydrogen polysulfides ($\ce{H2S_n ; n\geq2}$). It has long sulfur chains and is formulated as $\ce{H-(S)_{n}-H}$. To avoid confusion, each members of the mixture is named according to number of sulfur atoms. So, $\ce{H2S2}$ is hydrogen disulfide. Long answer: It is prepared ...


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