Why are columns called families on the periodic table?
In theperiodictable of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families. (See also ThePeriodicTable: Metals, Nonmetals, and Metalloids.)
Why are columns called families on the periodic table? - Quora
The reason is pretty simple elements in the same columns belong to the same family or group because they then to share similar chemical properties due to the fact that they have the same valence electron shell configuration .