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What is the difference between the notations l and L ?

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**Step-by-Step Solution:** 1. **Understanding the Notations**: The question asks about the difference between the notations 'l' and 'L'. 2. **Definition of Small 'l'**: The notation 'l' refers to the azimuthal quantum number. This quantum number is essential in quantum mechanics and is used to describe the shape of an electron's orbital within an atom. 3. **Function of Azimuthal Quantum Number**: The azimuthal quantum number 'l' can take on integer values from 0 to (n-1), where 'n' is the principal quantum number. The values of 'l' correspond to different types of orbitals (s, p, d, f), which have distinct shapes. ...
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