Cheat sheet · NEET Preparation Physics
Atoms cheat sheet
The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.
NEET · Physics
Cheat sheet
Class 12 · Chapter 12Atoms
Bohr: angular momentum quantised, L = nh/2π.
1. Rutherford Model
- α-scattering: most pass, a few deflect, very few bounce back.
- Nucleus tiny and dense.
- Distance of closest approach: KE = kZe·2e/r₀.
2. Bohr Model (hydrogen)
Å
eV
3. Spectral Series
| Series | n₁ | Region |
|---|---|---|
| Lyman | 1 | UV |
| Balmer | 2 | visible |
| Paschen | 3 | IR |
| Brackett | 4 | IR |
| Pfund | 5 | IR |
4. Key Points
- Ionisation energy of H = 13.6 eV.
- Bohr model fails for many-electron atoms.
- Line spectra are atomic fingerprints.
- Excitation needs exact energy.
Remember: Rutherford | Bohr r, E | 5 series
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- Mechanical Properties of Fluids
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- Thermodynamics
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- Oscillations
- Waves
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