Question

In the modern periodic table, What are the vertical columns called?

Answer 1

Periodic table:

1. In the modern periodic table, the elements are arranged based on the increasing atomic numbers.
2. The elements having the equal number of electrons in their valence shells are placed in same vertical columns called groups.
3. The modern periodic table contains 18 groups and 7 periods.

Therefore, in the modern periodic table, the vertical columns are called groups.