Question

What are s-s bonds?

Answer 1

Presumably you mean a sulfur-sulfur bond?

Explanation:

Peroxide bonds, `O-O`, are known; what is the oxidation state of `O` here?

Polysulfide bonds are much more common. The next time you are in a lab, get some elemental sulfur, i.e. `S_8`, and drop some in water. As you probably know, sulfur is practically insoluble in water. Add a bit of sulfide salt, say `Na_2S`. The sulfur will go up magically. Why?

Elemental sulfur is reduced by sulfide to give a polysulfide salt:

`S_8(s) + S^(2-) rarr ""^(-)S-S-S-S-S-S-S-S-S^-`

The chain length can vary.