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Two elements that have properties similar to those of the element sodium?
in the same group (family or column) on have similar properties. This due primarily to their electron configurations, in which the number of are the same.
Sodium is group 1/IA, the alkali metals, on the periodic table. Therefore, the other elements in this group will have similar properties as sodium. These would include, lithium, potassium, rubidium, and cesium. All of these elements have an that ends with ##"s"^1"##. Francium's properties have not been determined experimentally, because so far there has not been enough of it to experiment with.