Final answer:
Rubidium (Rb) is classified as an alkali metal found in Group 1 of the periodic table.
Explanation:
Rubidium (Rb) is classified as an alkali metal. Alkali metals are found in Group 1 of the periodic table and include elements such as lithium, sodium, potassium, rubidium, cesium, and francium. They are highly reactive metals with low melting points and are noted for their vigorous reactions with water.
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