The attractive force which holds various constituents together in different chemical species is called

Options

A. valence bond
B. chemical bond
C. atomic bond
D. electrovalent bond.

Explanation

To answer the question, "The attractive force which holds various constituents together in different chemical species is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking for the term that describes the attractive force that binds different atoms or molecules together in chemical species.

2. **Identifying Key Terms**: The key terms in the question are "attractive force" and "chemical species." We need to find a term that encapsulates the concept of attraction between atoms or molecules.

3. **Exploring Possible Answers**:
- **Chemical Bond**: This is a general term used to describe the attractive forces that hold atoms together in compounds. It includes various types of bonds such as ionic bonds, covalent bonds, and metallic bonds.
- **Valence Bond**: This term refers specifically to a type of bond formed by the overlap of atomic orbitals but does not encompass all types of attractive forces.
- **Atomic Bond**: This term is not commonly used in chemistry and does not accurately describe the attractive forces between atoms.
- **Electrovalent Bond**: This is another name for an ionic bond, which specifically involves the transfer of electrons rather than a general attractive force.

4. **Selecting the Correct Answer**: Given the definitions and the context, the term that best fits the description of the attractive force holding various constituents together in different chemical species is **Chemical Bond**.

5. **Conclusion**: The correct answer to the question is **Chemical Bond**.

### Final Answer:
The attractive force which holds various constituents together in different chemical species is called **Chemical Bond**.