Which of the following statemwnt regarding valence bond theory `(VBT)` is not true ? .

Options

A. A molecule is considered to be a collection of atoms, and the interactions between different atoms is considered .
B. For a molecule to be stable the electrostatic attactions must predominate over the repulsion .
C. The potential energy of a diatomic molecule is less than the sum of potential energies of free atoms .
D. The net force of altration acting on the atoms in a molecule is not
zero .

Answer

To determine which statement regarding valence bond theory (VBT) is not true, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Valence Bond Theory (VBT)**:
- VBT explains how covalent bonds are formed through the overlap of atomic orbitals. The greater the overlap, the stronger the bond.

2. **Analyzing the Statements**:
- **Statement 1**: "A molecule is considered to be the collection of atoms and the interaction between different atoms is considered."
- This statement is true. In VBT, molecules are indeed viewed as collections of atoms, and the interactions (bonds) between them are crucial.

- **Statement 2**: "For a molecule to be stable, the electrostatic attractions must predominate over the repulsion."
- This statement is also true. For a molecule to be stable, the attractive forces between the nuclei and the shared electrons must outweigh the repulsive forces between the electrons and between the nuclei.

- **Statement 3**: "The potential energy of a diatomic molecule is less than the sum of potential energies of free atoms."
- This statement is true. When atoms bond to form a molecule, the potential energy decreases, making the bonded state more stable than the individual atoms.

- **Statement 4**: "The net force of attraction acting on the atoms in a molecule is not 0."
- This statement is false. In a stable molecule, the forces of attraction and repulsion balance each other out, resulting in a net force of zero. This is a fundamental concept in molecular stability.

3. **Conclusion**:
- The statement that is not true regarding valence bond theory is the fourth statement: "The net force of attraction acting on the atoms in a molecule is not 0."

### Final Answer:
The statement that is not true regarding valence bond theory is **Statement 4**.

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