Quick Question on ion and enzymes

[dukedevils25]

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Just wanted to clarify some enzyme classification stuff....

First off
Cofactors can be inorganic and or organic (coenzymes) and then theres the Prosthetic Group; from what i understand the prosthetic group is tightly bound and the cofactors are freely diffusible

So:

What is the difference between:
Inorganic Cofactors ions and Prosthetic Group ions (i.e. - metalloproteins)

For example, what is the binding/functional/etc..differences of iron in Ferritin (a metalloprotein with the iron conjugated to the protein and behaves as a PROSTHETIC GROUP) and Peroxidase (where the iron behaves as a COFACTOR for the protein)

I am guessing cofactors mean the group is freely difusible while in prosthetic groups, the iron is essential for the structure

I dont wanna say that in one case, the ion is essential for the functionality and in the other it isn't because I assume that in BOTH cofactors and prosthetic group, the iron ion must be present for the functionality...

thanks