Chapter 27 of 32
Revision Notes
Atomic and Nuclear Physics — Revision Notes
NEET-UG · Physics
Free Atomic and Nuclear Physics revision notes for NEET-UG Physics 2026 — key concepts, formulas, and definitions for quick revision.
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Key concepts, formulas, and definitions from Atomic and Nuclear Physics for NEET-UG Physics preparation.
Key Topics to Revise
1
Early Atomic Models
- Thomson's plum pudding model proposed atoms as solid spheres with uniformly distributed positive charge and embedded electrons
- Alpha-scattering experiment by Geiger-Marsden revealed most alpha particles pass undeflected, few scatter at large angles
- Rutherford's nuclear model established that most atomic mass and all positive charge concentrate in a tiny nucleus
2
Bohr's Atomic Model and Hydrogen Spectrum
- Electrons revolve in circular orbits without radiating energy (first postulate)
- Angular momentum is quantized: L = nℏ where n = 1,2,3... (second postulate)
- Energy is emitted/absorbed only during transitions between orbits (third postulate)
3
Quantum Numbers and Electronic Configuration
- Principal quantum number (n): determines main energy level, n = 1,2,3...
- Orbital quantum number (l): determines subshell shape, l = 0,1,2...(n-1)
- Magnetic quantum number (mₗ): determines orbital orientation, mₗ = -l to +l
4
Nuclear Structure and Properties
- Nucleus contains protons and neutrons (nucleons) with Z protons and N neutrons
- Mass number A = Z + N, represents total nucleons
- Nuclear radius R = R₀A¹/³ where R₀ = 1.2 fm
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Key Concepts
The 'plum pudding' model where positiveGold foil experiment showing most αElectrons revolve in stable circular orbitsEmission spectrum consists of discrete linesFour quantum numbers describe electron state
Frequently Asked Questions
What topics are covered in Atomic and Nuclear Physics for NEET-UG?
Atomic and Nuclear Physics is an important chapter in NEET-UG Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Early Atomic Models, Bohr's Atomic Model and Hydrogen Spectrum, Quantum Numbers and Electronic Configuration, Nuclear Structure and Properties.
How important is Atomic and Nuclear Physics for NEET-UG?
Atomic and Nuclear Physics is a frequently tested chapter in NEET-UG Physics. Questions from this chapter appear regularly in previous year papers. There are 89 practice questions available for this chapter.
How to prepare Atomic and Nuclear Physics for NEET-UG?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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