Question

which metal ions are used as a co factor?

Answer 1

Iron, magnesium, manganese, cobalt, copper, zinc, and molybdenum although chromium are used as a cofactor.

Answer 2

A cofactor is a metallic ion or non-protein chemical compound.they can be both an inorganic and organic component. In humans these are the commonly found ions are-

iron, magnesium, manganese, copper, zinc,  cobalt, and molybdenum