Answer:
Alkaline earth metals
Step-by-step explanation:
Magnesium (12) and Calcium (20) are both found in the second family of the periodic table, and thus share many properties.
Alkaline Earth metals
The second family on the periodic table are the alkaline earth metals. They share some properties such as 2 valence electrons, low electronegativities, and are mostly reactive.
Metal
They are also both metals, which means they share some properties along with all metals. For example, they both become positive ions when they are bonded with a non-metal.