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 3. **Niels Bohr (1913)**
    * Developed the Bohr model of the atom with quantized energy levels.
    * **Formula**: Energy levels of hydrogen: $\huge \color{DeepSkyBlue} {E_n = - \frac{13.6}{n^2} \text{ eV}}$
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+<br>
 
+4. **Erwin Schrödinger (1926)**
+   * Developed Schrödinger's equation, forming the basis of wave mechanics.
+   * **Formula**: Schrödinger's equation: $\huge \color{DeepSkyBlue} {i\hbar \frac{\partial}{\partial t} |\psi(t)\rangle = \hat{H} |\psi(t)\rangle}$
+
+<br>
+
+5. **Werner Heisenberg (1927)**
+   * Introduced the Uncertainty Principle, a cornerstone of quantum mechanics.
+   * **Formula**: Uncertainty relation: $\huge \color{DeepSkyBlue} {\Delta x \Delta p \geq \frac{\hbar}{2}}$
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+<br>