Chapter 3
Classification of Elements and Periodicity in Properties
Classification of elements and periodicity in properties is a crucial topic in chemistry covered in class 11 CBSE. The topic provides a deep understanding of concepts involved in the periodicity of the element. In this article, you will find most concepts pertaining to NCERT Solutions for Class 11 chemistry, their elements, properties, as well as formulae.
Classification of elements and periodicity in properties is an important chapter; therefore, the students are advised to go through it thoroughly to develop a robust understanding of various concepts, which will help you score higher grades in class 11.
We have tailored our Classification of Elements and Periodicity in Properties NCERT Solutions chapter to meet our student's needs, which will further help them crack entrance examinations. This chapter has been prepared by our subject experts, where many aspects of periodicity are discussed wisely. This data follows a step-by-step procedure to help extract chapter 3 notes to solve the previous year's question papers.
To help students be thorough about each concept regarding chemistry chapter 3 class 11 Classification of Elements and Periodicity in Properties, all of the core principles are elaborated in easy-to-understand language, which will answer every query of your NCERT Textbook.
Topics covered in this Chapter- Contents table
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Sr. No. |
Topics |
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1 |
Classification of Elements and Periodicity in Properties (Introduction) |
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2 |
Why do we Need to Classify Elements? |
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3 |
Genesis of Periodic Classification |
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4 |
Modern Periodic Law and the present form of the Periodic Table |
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5 |
Nomenclature of Elements with Atomic Numbers > 100 |
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6 |
Electronic Configurations of Elements and the Periodic Table |
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7 |
Electronic Configurations and Types of Elements: s-, p-, d-, f – Blocks |
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8 |
Periodic Trends in Properties of Elements H2: Classification of Elements and Periodicity in Properties |
Classification of Elements and Periodicity in Properties: Introduction
In the early 1800s, Johann Wolfgang Dalereiner was the first scientist who attempted to formulate the classification of elements or periodicity in properties. During one of his experiments in 1829, he pointed out that elements with similar properties formed a group three, which he later termed as "Triads." some triads he classified are:
- Chlorine, Bromine, and Iodine
- Sulfur, Selenium, and Tellurium
- Calcium, Strontium, and Barium
- Lithium, Sodium, and Potassium
For CBSE students, chapter 11 Classification of Elements and Periodicity in Properties serves as an introduction to elements, their classification, and periodicity in properties. In this chapter, we have summarised the various aspects of elements, the need to classify elements, and other important topics that will help students obtain a better understanding of this concept and gain higher marks.
Let's have a look at the topics below to obtain a better understanding of these topics.
Why do we need to classify elements?
There could be various reasons why there's a need to classify elements. Below, we have listed some of them:
- Classification of elements promotes a clearer understanding of the properties of elements and their respective compounds.
- Depending on the positioning of elements in the periodic table, the properties of the elements and their compounds can be easily predicted.
- Once the elements are classified in the periodic table, it becomes easier to study, compare, and differentiate their properties and compounds from the various groups.
Note- One should be aware of the fact that there are seven periods in the modern periodic table. It usually holds metals on the right-hand side and non-metals on the left side of the table, along with eighteen groups. These elements have similar chemical behaviour.
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