![]() ![]() At this point in your study of chemistry, you should memorize the names, formulas, and charges of the most common polyatomic ions. With the exception of hydrogen, all elements that form positive ions by losing electrons during chemical reactions are called metals. Oxyanions are polyatomic ions that contain one or more oxygen atoms. Here, chloride ions are in our solution, which is a group 7 element so chlorine gas forms at the cathode instead of oxygen.\). We know that at the anode (positive electrode), oxygen is formed in the absence of a group 7 element.In this case, hydrogen is the least reactive so hydrogen gas will form at the anode. ![]() The rule is that it will be the least reactive of the two elements. ![]()
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