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+### 6. **Max Planck (1900)**  <br>  ──────────────  
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+   * Pioneered Quantum Theory**: Introduced the concept of energy quantization, proposing that energy is emitted or absorbed in discrete units called "quanta." ([Chemistry LibreTexts](https://chem.libretexts.org/Courses/University_of_Arkansas_Little_Rock/Chem_1402%3A_General_Chemistry_1_%28Kattoum%29/Text/6%3A_The_Structure_of_Atoms/6.2%3A_Quantization%3A_Planck%2C_Einstein%2C_Energy%2C_and_Photons?utm_source=chatgpt.com))
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