Combination of two `AO` s lead to the formation of .

Options

A. `2 MO' s`
B. `1 MO`
C. `3 MO's`
D. `4 MO's`

Answer

To solve the question regarding the combination of two atomic orbitals (AOs) leading to the formation of molecular orbitals (MOs), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Atomic Orbitals**:
- Atomic orbitals are regions in an atom where there is a high probability of finding electrons. They can be thought of as wave functions that describe the behavior of electrons.

2. **Combination of Atomic Orbitals**:
- When two atomic orbitals combine, they can interfere with each other. This interference can be constructive or destructive.

3. **Constructive Interference**:
- Constructive interference occurs when the wave functions of the two atomic orbitals align in such a way that their crests coincide. This results in a wave of greater amplitude, which corresponds to a lower energy state.
- This type of combination leads to the formation of a **bonding molecular orbital (BMO)**.

4. **Destructive Interference**:
- Destructive interference occurs when the crest of one wave coincides with the trough of another wave. This results in a wave of lesser amplitude, which corresponds to a higher energy state.
- This type of combination leads to the formation of an **anti-bonding molecular orbital (ABMO)**.

5. **Conclusion on Molecular Orbitals Formation**:
- From the combination of two atomic orbitals, we obtain two molecular orbitals: one bonding molecular orbital and one anti-bonding molecular orbital.
- Therefore, the answer to the question is that the combination of two atomic orbitals leads to the formation of **two molecular orbitals**.

### Final Answer:
The combination of two atomic orbitals leads to the formation of **two molecular orbitals** (one bonding and one anti-bonding).

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