What are the postulates of Bohr's model of an atom?

Explanation

**Step-by-Step Solution:**

1. **Definition of Bohr's Model**: Bohr's model of the atom was proposed by Niels Bohr in 1913 to explain the behavior of electrons in atoms, particularly hydrogen.

2. **First Postulate**: Electrons revolve around the nucleus in certain definite circular paths called orbits or shells. These orbits are designated as K, L, M, N, etc., where N represents the principal quantum number (N = 1, 2, 3, 4, ...).

3. **Second Postulate**: The maximum number of electrons that can occupy a shell is given by the formula 2N². For example:
- For N = 1 (K shell), maximum electrons = 2(1)² = 2
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