This question should be quite simple. Yet I am getting it wrong. It it's really frustrating. Can someone see what i'm doing wrong? Or maybe it's because my concepts are messed up.

Assuming standard conditions, and considering the table of standard reduction potentials for half-reactions, given in your text, rank the following species according to their relative strength as reducing agents. For example, the most powerful reducing agent would be given rank "1", and the least "6".

Cd

I-

Fe2+

Zn

F-

K

A link for a Standard reduction potential table is here:

http://www.jesuitnola.org/upload/clark/refs/red_pot.htmThe order I got was 4,3,2,5,1,6 ( F-, Fe2+, I-, Cd, Zn, K)

Reasoning is that the reducing agent is oxidized and therefore loses the electrons. So looking at the standard reduction potential table, I got my voltage values from there, and changed the signs where I needed to. But i keep getting it wrong. Help and a push in the right direction would be fantastic. =]