Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.

Explanation

To determine the important conditions required for the linear combination of atomic orbitals (LCAO) to form molecular orbitals, we can follow these steps:

### Step-by-Step Solution:

1. **Comparable Energies**:
- The atomic orbitals that are to be combined must have energies that are similar or comparable. This ensures that the orbitals can effectively interact with each other. For instance, a 1s orbital will primarily combine with another 1s orbital, a 2s with a 2s, and a 2p with another 2p orbital.

2. **Proper Orientation and Shape**:
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