A "family" of elements means the vertical columns in the Periodic Table. If you look above the periodic table, there will be numbers for each row, numbered from 1 to 18. Each "family" is a column.
Actinides family
Elements in the same family (group) on the periodic table have the same number of valence electrons and hence they have similar properties and reactivities.
WHAT ARE THE ELMENTS IN KA13Si3013
by their atomic number
15
by the elments an protons
Calcium, carbon and oxygen
the periodic table has all the elments
alcohols carbohydrates sugars
nitrogen and oxygen in NO2
How are elements described in terms of their atoms
Mg2+ and Ca2+ (and many more!)