State two key points of Bohr's atomic model.

Explanation

**Step-by-Step Text Solution:**

1. **Electrons in Defined Orbits**: Bohr's atomic model states that electrons revolve around the nucleus in specific paths called orbits. These orbits are not random but are defined and quantized.

2. **Energy Levels of Orbits**: Each orbit corresponds to a specific energy level. This means that electrons in different orbits have different amounts of energy, and these orbits are referred to as energy shells or energy levels. The first orbit is designated as 'K', the second as 'L', the third as 'M', and so on.

**Final Answer**:
1. Electrons revolve around the nucleus in defined orbits.
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