Chapter 15, Problem 9RQ

To determine

The number of groups in the periodic table.

Answer to Problem 9RQ

The number of groups in the periodic table is eighteen.

Explanation of Solution

The chart that lists all the known elements in the universe is called a periodic table. It classifies elements based on their properties. There are vertical columns known as groups and horizontal rows known as periods.

The elements within the same group have similar physical and chemical properties. There are total eighteen groups in a periodic table. The elements with having an equal number of valence electrons fall under a single group. Thus the elements with same properties are categorized into same group.

Conclusion:

Therefore, the number of groups in the periodic table is eighteen.