Re: Jarvis said Iodine cannot displace bromide???

Correct. Iodine is at the bottom of the list:
The halogen group is made up as follows:
Relative Atomic Weight
Halogen
Fluorine 19.
Chlorine 35.5
Bromine 80.
Iodine 127.

"The critical activity of any one of these four halogens is in inverse proportion to its atomic weight. This means that any one of the four can displace the element with a higher atomic weight, but cannot displace an element with a lower atomic weight. For example, fluorine can displace chlorine, bromine and Iodine because fluorine has a lower atomic weight than the other three. Similarly, chlorine can displace bromine and Iodine because they both have a higher atomic weight. Likewise, bromine can displace iodine from the body because iodine has a higher atomic weight. But a reverse order is not possible. A knowledge of this well-known chemical law brings us to a consideration of the addition of chlorine to our drinking water as a purifying agent. We secure a drinking water that is harmful to the body not because of its harmful germ content but because the chlorine content now causes the body to lose the much-needed iodine." Folk Medicine, D. C. Jarvis
snipped from here:

http://www.jcrows.com/iodine.html
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