Chapter 6, Problem 26A

Interpretation Introduction

Interpretation:

The contribution of Newland’s law of octaves to the development of the modern periodic table needs to be explained.

Concept introduction:

In 1866, John Newlands proposed the law of octaves which states that in arranging elements in order of increasing atomic masses, every eighth element possesses properties similar to the first.

Answer to Problem 26A

Newland’s law of octaves gives the idea of repetitive pattern of the periodic table.

Explanation of Solution

Newland’s law of octaves was the first which shows the repeating pattern in terms of the properties of elements. This law is based on arrangements of elements considering their atomic mass and there were many elements which does not follow this law. This law was later considered in the organization of the periodic table by atomic number rather than atomic mass. The repetitive nature of the periodic table supported Moseley’s theory which states that if elements are arranged considering the atomic number, repetitive pattern is observed in the periodic table.

Conclusion

Our periodic table is a periodic function of the atomic numbers. Newland’s law of octaves was the first to bring the idea of repetitive nature.