Problem 36 What is the basic difference bet... [FREE SOLUTION]

Chapter 3: Problem 36

What is the basic difference between Mendeleeff's periodic table and modern periodic table?

Short Answer

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Answer: The basic difference between Mendeleev's periodic table and the modern periodic table lies in the organization and classification of elements. Mendeleev's table was based on the elements' atomic weights, whereas the modern periodic table is organized according to the elements' atomic numbers. Consequently, the modern periodic table is a more accurate and consistent way to display the periodic trends and chemical properties of the elements.

Step by step solution

Mendeleev's Periodic Table

Dmitri Mendeleev, a Russian chemist, created the first periodic table in 1869. He organized the elements based on their atomic weights and chemical properties, arranging elements with similar properties into vertical columns known as groups. He even left some gaps in his table, predicting the discovery of new elements which would fit the table's pattern. However, there were several discrepancies in his table, such as certain elements being out of order with respect to their atomic weights.

Modern Periodic Table

The modern periodic table was developed in 1913 by Henry Moseley, which is based on the atomic numbers of the elements. This resolved the issues with Mendeleev's table, proving a more accurate and systematic way to organize the elements. The modern periodic table has 18 columns called groups, and 7 rows called periods. Elements in the same group have similar chemical properties, while elements in the same period have an increasing number of electrons in their outermost energy levels.

Basic Difference

The basic difference between Mendeleev's periodic table and the modern periodic table lies in the organization and classification of elements. Mendeleev's table was based on the elements' atomic weights, whereas the modern periodic table is organized according to the elements' atomic numbers. Consequently, the modern periodic table is a more accurate and consistent way to display the periodic trends and chemical properties of the elements.

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What is the basic difference between Mendeleeff's periodic table and modern periodic table?

Short Answer

Step by step solution

Mendeleev's Periodic Table

Modern Periodic Table

Basic Difference

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