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The elements in Group 2, which are the Alkaline earth metals. want to lose two electrons, and not just one. It is the elements of Group 1 in the Periodic Table, the Alkali metals, that want to lose a single electron.

In any case, the elements of these groups that most want to lose an electron (Group 1) or two (Group2) are found at the bottom of those groups. (There is one exception, and we'll get to that.) In general, reactivity increases as we look down the groups on the left side of the periodic table. In the case of Group 1, which is composed of lithium, sodium, potassium, rubidium, caesium and francium, it is caesium that is the most reactive. That's the exception to the rule, as francium, which is farther down the group, is a bit less reactive than caesium. The element caesium wants to lose an electron more than any of the other elements in that group. In the case of the Group 2 elements, which include beryllium, magnesium, calcium, strontium, barium and radium, it is radium that is most reactive. And it is radium that wants to lose two electrons more than any other element in that group.

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