Sodium is more reactive than calcium because it has one electron in its outermost shell which means that its last shell is incomplete.
Sodium is more reactive than calcium atom because sodium has one outermost electron. Outermost electrons in sodium atom are less tightly held as a result sodium loses its outermost electron more easily and become stable element.
So we can conclude that Sodium is more reactive than calcium because it has one electron in its outermost shell which means that its last shell is incomplete.
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