Limitations of Bohr's Model || Atoms - 9 || for Class 12 in Hindi

In this Physics video in Hindi for Class 12 we explained some of the limitations of Bohr's atomic model. This is a topic from Chapter 12 : 'Atoms' for Class 12 from NCERT.

Some of the limitations are :

(i) The Bohr model is applicable to hydrogenic atoms. It cannot be extended even to mere two electron atoms such as helium. The analysis of atoms with more than one electron was attempted on the lines of Bohr’s model for hydrogenic atoms but did not meet with any success. Difficulty lies in the fact that each electron interacts not only with the positively charged nucleus but also with all other electrons. The formulation of Bohr model involves electrical force between positively charged nucleus and electron. It does not include the electrical forces between electrons which necessarily appear in multi-electron atoms.

Experimental studies show that there exist several very close energy levels for a single principal quantum number, which can only be explained by the concept of orbitals with the help of quantum mechanics. Bohr’s model is unable to explain that.

(ii) While the Bohr’s model correctly predicts the frequencies of the light emitted by hydrogenic (hydrogen like) atoms, the model is unable to explain the relative intensities of the frequencies in the spectrum. In emission spectrum of hydrogen, some of the visible frequencies have weak intensity, others strong.
Experimental observations depict that some transitions are more favoured than others. Bohr’s model is unable to account for the intensity variations.
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🔴 Chapter : 'Atoms' for Class 12 :
https://www.youtube.com/playlist?list=PLW0F47OesfFOQZ4Vpmh1WPrZHpZc0a-IK

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🔴 Chapter : 'Nuclei' (DELETED) for Class 12 :
https://www.youtube.com/playlist?list=PLW0F47OesfFP0ApiNCimccK34pTsze9XX

🔴 Chapter : 'SEMICONDUCTOR ELECTRONICS' for Class 12 :
https://www.youtube.com/playlist?list=PLW0F47OesfFNg35fRk7ywRO2Vb6dlMEzE
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🔴 Introduction to Atoms
https://youtu.be/uw5DJnhzF0Q

🔴 Discovery of Electron
https://youtu.be/y2VMkKJlPuk

🔴 ALPHA Particle Scattering and RUTHERFORD's Nuclear Model of Atom
https://youtu.be/Rxg-zCtK0Lg

🔴 Atomic Spectra
https://youtu.be/6vWYYYDHxu8

🔴 Bohr Model
https://youtu.be/pQcO0BhEs3A

🔴 Bohr Model 2 || Energy Levels of Electrons
https://youtu.be/1N9Q245iARE

🔴 Line Spectra of Hydrogen
https://youtu.be/VTpnnc5tcDE

🔴 How de Broglie Explained Bohr's Second Postulate
https://youtu.be/NgVd3G9bBWk

Видео Limitations of Bohr's Model || Atoms - 9 || for Class 12 in Hindi канала EduPoint