Chapter 3, Problem 68A

Interpretation Introduction

Interpretation:

Dmitri Mendeleev’s contribution should be determined.

Concept introduction:

Dmitri Ivanovich Mendeleev was a Russian inventor and a very well-known chemist. He was born in 1834 and dies in 1907.

Answer to Problem 68A

Periodic law and periodic table.

Explanation of Solution

Mendeleev major contribution in chemistry includes the formulation of the periodic law, which helped in the formation of the modern periodic table of elements. According to Mendeleev’s study, when all the known elements are arranged in order of increasing atomic weight, the resultant pattern shows a recurring property, which is also known as the periodicity.

The atomic mass is the sum of number of protons and neutrons of the elements and the atomic number is the number of proton. The modern periodic table is arranged according to the atomic number, which is similar to the one suggested by Mendeleev.