It does not replace a metal higher on the series. Because the halogens are highly reactive, none is found in nature as the free element. ![]() The increase in reactivity with increasing atomic number only occurs for the metals in groups 1 and 2. So, a metal that is higher on the activity series replaces one lower on the series. To understand the periodic trends and reactivity of the group 17 elements: the halogens. (This is the reverse of the reactivity trend of the metals of groups 1 and 2, in which reactivity increases down a group. ![]() How to Use the Metal Activity Series Example Problems. The 2+ ions of the alkaline earth metals have a noble gas like electron configuration and are thus form colorless or white compounds (unless the anion is itself colored). From the table, note that the most reactive metal on the periodic table is cesium. The specific arrangement of Group 1 elements on the periodic table allows us to make predictions about their reactivity.
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