CBSE Class 11 Chemistry Structure Of Atom Notes Set 01

Official Class 11 Chemistry Revision Material: CBSE Class 11 Chemistry Structure Of Atom Notes Set 01

Review targeted revision notes for Class 11 Chemistry with the CBSE Class 11 Chemistry Structure Of Atom Notes Set 01. Built according to official educational guidelines for the 2026-27 academic year, these downloadable summaries for Chapter 02 Structure of Atom support daily study and last-minute exam readiness.

Chapter-wise Concept Summaries: Chapter 02 Structure of Atom

Access the complete concept summary PDF for Chapter 02 Structure of Atom below. Regular review of these targeted notes builds familiarity with complex Class 11 Chemistry themes and helps secure higher marks in final school evaluations.

 

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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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Chapter 02 Structure of Atom Concepts and Summary for Class 11 Chemistry

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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 01 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.

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Yes, our CBSE Class 11 Chemistry Structure Of Atom Notes Set 01 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.

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