Chapter 3, Problem 31A

Interpretation Introduction

Interpretation: The property of the elements considered when arranging the elements in the periodic table needs to be explained.

Concept introduction: 

A table in chemistry, where all elements are arranged by increasing atomic number is described as periodic table. There are more than 100 elements in the world and the periodic table classifies these elements.

Answer to Problem 31A

The chemical elements in a periodic table, are arranged in order of increasing atomic number.

Explanation of Solution

The periodic table is a very useful way to arrange elements. In the periodic table, vertical columns are known as families and horizontal rows are known as period. The properties of elements in vertical groups on the periodic table are similar, just like the characteristics of a particular human family are often similar. In a periodic table, elements are organized from left - right and also, top - bottom in an order of increasing atomic numbers.

Conclusion

In a periodic table, every element has unique physical properties (density, boiling point, melting point, etc.).