Classification of Elements and Periodicity in Properties Class 11 Notes
Chapter 3 Classification of Elements and Periodicity in Properties
Chapter 3 of the NCERT notes for Class 11 Chemistry, Element Classification and Property Periodicity, is a useful resource for students looking to improve their test scores. This document provides a comprehensive description of the NCERT notes for Class 11 Chemistry Chapter 3, which requires a deep understanding of the subject matter to grasp the concept.
CBSE Class 11 Chemistry Chapter 3 covers the origins of periodic classifications, s- and p-block elements, metals, non-metals and metalloids. Students should focus primarily on the text questions provided by Vidyakul in order to score well on the exam. Scroll down to access Chapter 3 Chemistry Class 11 notes.
CBSE 11th CHEMISTRY CH-3
Points to Remember
Students can find the important points related to Class 11 Chemistry Chapter 3 as mentioned below:
Dobereiner’s triads: When three elements of a triad were arranged in order of increasing atomic weights, the atomic weight of the middle element was either nearly the same or the atomic weight of the middle element was approximately the arithmetic mean of the other two.
Newlands law of octaves: When lighter elements were arranged in order of their increasing atomic weights, the properties of every eighth element were similar to those of the first like the eighth note of a musical scale.
Lother-Meyer plotted a graph between atomic volume of the elements against their atomic weights. He observed that the elements with similar properties occupied similar positions on the curve.
Mendeleev’s period law states that physical and chemical properties of elements are a periodic function of their atomic weights.
Modern periodic law states that physical and chemical properties of the elements are a periodic function of their atomic numbers.
Modern periodic table is also called long form of the periodic table or Bohr’s table.
Atomic radius is the distance between the centre of the nucleus to the outermost shell containing electrons.
Covalent radius is one-half the distance between the nuclei of two covalently bonded atoms of the same element in a molecule.
van der Waals radius is one-half the distance between the nuclei of two adjacent identical atoms belonging to two neighbouring molecules of an element. It is also called inert gas radii.
Metallic radius is one-half the internuclear distance between the two adjacent metal ions in the metallic lattice.
Periodicity of Valence: The valence of representative elements is usually equal to the number of electrons in the outermost orbitals and/or equal to eight minus the number of outermost electrons.
Some elements of the second period show a diagonal relationship with elements of the third period and hence exhibit some similar properties.
Topics and Sub-Topics
Chapter 3 of NCERT Class 11 Chemistry is one of the important topics to get a good score on the exam. Although this chapter may seem daunting at first, learning more about the concepts and solving problems will help students master the subject. Students are encouraged to revise the topic daily to better prepare for the final exam.
Vidyakul provides notes to all problems in Chapter 3 of the Grade 11 Chemistry Textbook based on the latest version of the curriculum. Students can also practice all notes for free.
Below-mentioned is the list of topics present in CBSE Class 11 Chemistry chapter 3.
Frequently Asked Questions
How many elements are present in the periodic table?
A total of 118 elements are present in the periodic table.
What is the meaning of ionisation enthalpy?
The enthalpy change associated with the removal of the original electron from an atom with a single gas in its ground surface is called as the first ionization enthalpy.
What are the d-block elements?
D block elements are the elements that can be found from the third group to the twelfth group of the modern periodic table. The valence electrons of these elements fall under the d orbital. D block elements are also referred to as transition elements or transition metals.
Practice Questions
What is the difference between Modern Periodic Law and Mendeleev’s Periodic Law?
What is the ionic radius? What is the atomic radius?
What is isoelectronic species? Give an example.
Elements in the same group have similar chemical and physical properties. Why?
Dobereiner’s triads: When three elements of a triad were arranged in order of increasing atomic weights, the atomic weight of the middle element was either nearly the same or the atomic weight of the middle element was approximately the arithmetic mean of the other two.
Newlands law of octaves: When lighter elements were arranged in order of their increasing atomic weights, the properties of every eighth element were similar to those of the first like the eighth note of a musical scale.
Lother-Meyer plotted a graph between atomic volume of the elements against their atomic weights. He observed that the elements with similar properties occupied similar positions on the curve.
Mendeleev’s period law states that physical and chemical properties of elements are a periodic function of their atomic weights.
Modern periodic law states that physical and chemical properties of the elements are a periodic function of their atomic numbers.
Modern periodic table is also called long form of the periodic table or Bohr’s table.
Atomic radius is the distance between the centre of the nucleus to the outermost shell containing electrons.
Covalent radius is one-half the distance between the nuclei of two covalently bonded atoms of the same element in a molecule.
van der Waals radius is one-half the distance between the nuclei of two adjacent identical atoms belonging to two neighbouring molecules of an element. It is also called inert gas radii.
Metallic radius is one-half the internuclear distance between the two adjacent metal ions in the metallic lattice.
Periodicity of Valence: The valence of representative elements is usually equal to the number of electrons in the outermost orbitals and/or equal to eight minus the number of outermost electrons.
Some elements of the second period show a diagonal relationship with elements of the third period and hence exhibit some similar properties.
How many elements are present in the periodic table?
What is the meaning of ionisation enthalpy?
What are the d-block elements?
What is the difference between Modern Periodic Law and Mendeleev’s Periodic Law?
What is the ionic radius? What is the atomic radius?
What is isoelectronic species? Give an example.
Elements in the same group have similar chemical and physical properties. Why?
Learn more about it in Classification of Elements and Periodicity in Properties Class 11 Notes pdf.
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