Question

Which of the following statements about the Modern Periodic Table is correct:

विकल्प

• It has 18 horizontal rows known as Periods

• It has 7 vertical columns known as Periods

• It has 18 vertical columns known as Groups

• It has 7 horizontal rows known as Groups

Answer 1

It has 18 vertical columns known as Groups

Explanation - 

The modern periodic table has 18 vertical columns known as Groups.