Problem 37 Why are the lanthanides and the ... [FREE SOLUTION]

Chapter 3: Problem 37

Why are the lanthanides and the actinides given a separate position in the modern periodic table?

Short Answer

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Answer: The lanthanides and actinides are given a separate position in the modern periodic table due to their unique properties, distinct electron configurations, and to maintain the periodic table's organization and compactness. This separate placement allows for a focus on their individual characteristics and highlights the similarities and differences between the two series of elements.

Step by step solution

Introduction and Periodic Table Overview

The modern periodic table is organized by the atomic number and electron configuration. The periodic table is divided into periods and groups, which represent horizontal rows and vertical columns, respectively. The elements are arranged in such a way that elements with similar properties fall into the same group.

Electron Configurations of Lanthanides and Actinides

In the lanthanides series, the elements have their 4f subshells being filled. These elements are present in the 6th period and the 3rd group of the periodic table. On the other hand, the actinides series elements have their 5f subshells being filled, and these are found in the 7th period and the 3rd group of the periodic table.

Unique Properties of Lanthanides and Actinides

Lanthanides and actinides have some unique properties that differentiate them from the rest of the elements in the periodic table. Some of these properties include: 1. Both series of elements have very similar and unique chemical properties. 2. Lanthanides have high reactivity and form(+3) oxidation state ions. 3. Actinides are radioactive and can form multiple oxidation states in their compounds. 4. Lanthanides and actinides have unpaired electrons in their f orbitals, which gives them distinct magnetic properties.

Periodic Law and Lanthanides and Actinides

According to the periodic law, the elements' properties are a periodic function of their atomic numbers. The atomic numbers of lanthanides and actinides differ by a constant value, which is the number of f electrons. Their properties would have shown great similarity to other elements found in the same group in the periodic table. However, due to the unique characteristics of f-block elements, they exhibit different behavior.

Separate Position in the Modern Periodic Table

Since the lanthanides and actinides have unique properties and filling of their f orbitals, they are given a separate position in the modern periodic table to: 1. Focus on their unique characteristics and properties. 2. Keep the periodic table manageable and compact (otherwise, it would be much wider). 3. Highlight the similarities and differences between the two series of elements. In summary, the lanthanides and actinides are placed in separate positions in the modern periodic table due to their unique properties, distinct electron configurations, and to maintain the periodic table's organization and compactness.

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Why are the lanthanides and the actinides given a separate position in the modern periodic table?

Short Answer

Step by step solution

Introduction and Periodic Table Overview

Electron Configurations of Lanthanides and Actinides

Unique Properties of Lanthanides and Actinides

Periodic Law and Lanthanides and Actinides

Separate Position in the Modern Periodic Table

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