Sodium (Na) and calcium (Ca) are in different families of metals.
Name the families of metals in which they belong, and describe each
family's characteristics.

Sodium is a member of the Alkali Metals family and Calcium is part of the Alkaline Earth Metals family.

Alkali Metals characteristics: Silvery solid, very soft, low density, low melting point, extremely reactive especially in water, has 1 valence electron, reactivity increases as you go down the family.

Alkaline Earth Metals characteristics: contain 2 valence electrons, harder and denser than Alkali Metals, never found free in nature, and highly reactive.

Explanation:

Alkali Metals: Keep in mind Hydrogen is not part of the family, its just there in the same column because of the number of valence electrons in has.