Chapter 6, Problem 96A

Interpretation Introduction

Interpretation:

Dobereiner’s triads need to be explained. The elements comprising the triads and the similar properties of elements within a triad need to be explained.

Concept introduction:

Triad is any distinct set of three chemically comparable elements in which atomic weight of one is almost equal to the atomic weight of other two elements.

Answer to Problem 96A

Some triads are as follows:

Iron-cobalt-nickel, Carbon-oxygen-nitrogen, Chlorine-bromine-iodine, Lithium-sodium-potassium, etc.

Triad’s elements have similar chemical properties, density and atomic weight.

Explanation of Solution

In the early 1800s Johann Wolfgang Dobereiner (1780- 1849) was a German chemist who is known for the work for periodic law of chemical elements. By the use of physical property, he attempts to sort the elements into some logical order.  Triad’s elements have similar chemical properties, density and atomic weight. Earlier, atomic weight was used for classification of the elements. Some triads are as follows:

Iron-cobalt-nickel, Carbon-oxygen-nitrogen, Chlorine-bromine-iodine, Lithium-sodium-potassium, etc.

Conclusion

Triad’s elements have similar chemical properties, density and atomic weight. Some triads are as follows:

Carbon-oxygen-nitrogen, Chlorine-bromine-iodine, Lithium-sodium-potassium, Iron-cobalt-nickel, etc.