CBSE Class 11 Chemistry Structure Of Atom Notes Set A

Download the latest CBSE Class 11 Chemistry Structure Of Atom Notes Set A in PDF format. These Class 11 Chemistry revision notes are carefully designed by expert teachers to align with the 2025-26 syllabus. These notes are great daily learning and last minute exam preparation and they simplify complex topics and highlight important definitions for Class 11 students.

Chapter-wise Revision Notes for Class 11 Chemistry Chapter 2 Structure of Atom

To secure a higher rank, students should use these Class 11 Chemistry Chapter 2 Structure of Atom notes for quick learning of important concepts. These exam-oriented summaries focus on difficult topics and high-weightage sections helpful in school tests and final examinations.

Chapter 2 Structure of Atom Revision Notes for Class 11 Chemistry

 

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13. o Emission spectrum: The spectrum of radiation emitted by a substance that has absorbed energy is called an emission spectrum.

14. o Absorption spectrum : The spectrum obtained when radiation is passed through a sample of material. The sample absorbs radiation of certain wavelengths. The wavelengths which are absorbed are missing and come as dark lines.

15. Bohr’s model for hydrogen atom:

a.An electron in the hydrogen atom can move around the nucleus in a circular path of fixed radius and energy. These paths are called orbits orenergy levels. These orbits are arranged concentrically around the nucleus.

b. As long as an electron remains in a particular orbit, it does not lose or gain energy and its energy remains constant.

c. When transition occurs between two stationary states that differ in energy, the frequency of the radiation absorbed or emitted can be calculated

d. An electron can move only in those orbits for which its angular momentum is an integral multiple of h/2π The radius of the nth orbit is given by rn =52.9 pm x n2/Z

energy of electron in nth orbit is :

CBSE Class 11 Chemistry Revision Structure of Atom 1

 

16. Black body: An ideal body, which emits and absorbs all frequencies,is called a black body. The radiation emitted by such a body is called black body radiation.

CBSE Class 11 Chemistry Revision Structure of Atom 2

 

17. Photoelectric effect: The phenomenon of ejection of electrons from the surface of metal when light of suitable frequency strikes it is called photoelectric effect. The ejected electrons are called photoelectrons.
CBSE Class 11 Chemistry Revision Structure of Atom 3

 

18. Threshold frequency (vo): For each metal there is a characteristic minimum frequency below which photoelectric effect is not observed. This is called threshold frequency.

 

19. Heisenberg uncertainty principle: It is impossible to determine simultaneously the exact position and exact momentum of an electron. Mathematically, Δx x Δp ≥ h/ 4 π

 

20. Quantum number’s: These are the numbers obtained by solution of Schrodinger equation used to define the energy of electron its position, orientation and spinning.

 

21. There are four quantum numbers namely principal, azimuthal, magnetic and spin quantum no.
 
22. Bohr burry’s rule:- The lower the value of (n + l) for an orbital, the lower is its energy. If two orbitals have the same value of (n + l), the orbital with lower value of n will have the lower energy.
 
23. Degenerate orbitals The orbitals having the same energy are called degenerate orbitals.
 
24. Aufbau principle: electron filled in various subshell in increasing order of their energies.
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s……….
CBSE Class 11 Chemistry Revision Structure of Atom 4
 
25. Pauli’s exclusion principle: No two electrons in an atom can have same set of four quantum numbers.

 

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CBSE Class 11 Chemistry Chapter 2 Structure of Atom Notes

Students can use these Revision Notes for Chapter 2 Structure of Atom to quickly understand all the main concepts. This study material has been prepared as per the latest CBSE syllabus for Class 11. Our teachers always suggest that Class 11 students read these notes regularly as they are focused on the most important topics that usually appear in school tests and final exams.

NCERT Based Chapter 2 Structure of Atom Summary

Our expert team has used the official NCERT book for Class 11 Chemistry to design these notes. These are the notes that definitely you for your current academic year. After reading the chapter summary, you should also refer to our NCERT solutions for Class 11. Always compare your understanding with our teacher prepared answers as they will help you build a very strong base in Chemistry.

Chapter 2 Structure of Atom Complete Revision and Practice

To prepare very well for y our exams, students should also solve the MCQ questions and practice worksheets provided on this page. These extra solved questions will help you to check if you have understood all the concepts of Chapter 2 Structure of Atom. All study material on studiestoday.com is free and updated according to the latest Chemistry exam patterns. Using these revision notes daily will help you feel more confident and get better marks in your exams.

Where can I download the latest PDF for CBSE Class 11 Chemistry Structure Of Atom Notes Set A?

You can download the teacher prepared revision notes for CBSE Class 11 Chemistry Structure Of Atom Notes Set A from StudiesToday.com. These notes are designed as per 2025-26 academic session to help Class 11 students get the best study material for Chemistry.

Are these Chemistry notes for Class 11 based on the 2026 board exam pattern?

Yes, our CBSE Class 11 Chemistry Structure Of Atom Notes Set A include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Chemistry principles which is important for getting more marks in 2026 CBSE exams.

Do these Class 11 notes cover all topic-wise concepts for Chemistry?

Yes, our CBSE Class 11 Chemistry Structure Of Atom Notes Set A provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 11 is covered.

How can I use CBSE Class 11 Chemistry Structure Of Atom Notes Set A for quick last-minute revision?

These notes for Chemistry are organized into bullet points and easy-to-read charts. By using CBSE Class 11 Chemistry Structure Of Atom Notes Set A, Class 11 students fast revise formulas, key definitions before the exams.

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