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NCERT Solutions for Class 12 Physics Chapter 12 Atoms are given in this article. Atoms are the smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element. Atom is the basic building block of chemistry.
Unit 8 Atoms and Nuclei along with Unit 7 Dual Nature of Radiation and Matter has a weightage of 12 marks in the CBSE Board examinations. The Class 12 Physics Chapter 12 NCERT Solutions cover the concepts of Atomic Spectra, Magnetic Quantum Number, and energy levels.
Download PDF: NCERT Solutions for Class 12 Physics Atoms
NCERT Solutions for Class 12 Physics Chapter 12
The NCERT solutions for Class 12 Physics Chapter 12: Atoms is given below.
CBSE Class 12 Physics Chapter 12 – Topics Covered
- Thomson’s Atomic Model: Every atom is a uniformly positive charged sphere of radius of the order of 10-10 m, in which the entire mass is distributed uniformly and negatively charged electrons are randomly embedded randomly.
| Limitations of Thomson’s Atomic Model 1. It couldn’t explain the origin of spectral series of hydrogen and other atoms. 2. It couldn’t explain the large angle scattering of α-particles. |
- Bohr Model of the Hydrogen Atom: An electron can revolve in certain non-radiating orbits for which the angular momentum of electron is an integer multiple of (h/2π).
| \(r_n = n^2({h^2 \epsilon_o \over \pi mZe^2})\) |
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Hydrogen Spectrum Series: Each element emits a radiation spectrum, which is characteristic of the element itself. The spectrum is known as the line spectrum.
| Hydrogen spectrum consists of 5 series – Lyman Series, Balmer Series, Paschen Series, Brackett Series, and Pfund Series. |
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Wave Model is based on wave mechanics. Quantum numbers are the numbers that are required to completely specify the state of the electrons.
| In the presence of a strong magnetic field, the 4 quantum number are Principle quantum number, Orbital angular momentum quantum number, Magnetic quantum number, and Magnetic spin angular momentum quantum number. |
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