Bohr’s Atomic Model in 59 Seconds! | JEE Chemistry Quick Revision

 

⚛️ Bohr’s Atomic Model in 59 Seconds | Doubtify JEE Shorts

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📌 Question:

What explains the fixed energy levels of electrons in an atom and why do atoms emit light? Bohr’s Atomic Model gives us the first quantum explanation of atomic structure!

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📸 Image:

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📕 Concept & Formula:

1. Stationary Orbits:

   • Electrons revolve around the nucleus in fixed circular paths called orbits.

   • No radiation is emitted in these orbits.

2. Quantized Angular Momentum:

   $$mvr = \frac{nh}{2\pi}$$

   Where:
   m = mass,
   v = velocity,
   r = radius,
   n = orbit number (1, 2, 3…),
   h = Planck's constant

3. Energy Transitions:

   • When an electron jumps between orbits:

     $$\Delta E = E_2 - E_1 = h\nu$$

   • Energy is absorbed or emitted in the form of light/spectral lines

4. Energy of Orbit:

   $$E_n \propto -\frac{1}{n^2}$$

   → Lower orbit → More negative energy → More stability

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🔢 Example:

An electron jumps from n = 3 to n = 2, and emits energy.
This corresponds to Balmer series in the visible spectrum – a common question in JEE!

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🧠 JEE Tip:

• Memorize mvr = nh/2π and ΔE = hν

• Understand spectral line formation for Hydrogen

• Bohr’s model is limited to one-electron systems like H, He⁺, Li²⁺

• Diagrams help in visualizing orbit transitions

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🎥 Watch 59-Second Concept Video:

🧠 Pro Tip:

JEE loves asking energy level transitions and formulas like radius ∝ n² and velocity ∝ 1/n. Don't just memorize—visualize Bohr’s atom!

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