Question

use the periodic table to identify each of the elements below as an alkali metal or an alkaline earth metal. rb: alkali metal, alkaline earth metal; mg: alkali metal, alkaline earth metal; ca: alkali metal, alkaline earth metal

Explanation:

Alkali metals are in Group 1 of the periodic table. Alkaline - earth metals are in Group 2. Rubidium (Rb) is in Group 1, so it's an alkali metal. Magnesium (Mg) and Calcium (Ca) are in Group 2, so they are alkaline - earth metals.

Answer:

Rb: alkali metal
Mg: alkaline earth metal
Ca: alkaline earth metal