You should have noticed in this case that bromine reacted more readily than iodine. Notice that this is the opposite of what we found with the metals. With the metals, the element that was further down on the periodic table was more reactive. But with nonmetals over on the right side of the periodic table, the element which is further up is most reactive. This points out that there is something fundamentally different about the nonmetals compared to the metals. There is a fundamental difference between the way that metals and nonmetals react.

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