The number of atoms present in a molecule of an element is known as its

Options

A. valency
B. atomicity
C. chemical Formula
D. symbol

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the number of atoms present in a molecule of an element.

2. **Defining Atomicity**: The term that represents the number of atoms in a molecule of an element is called "atomicity."

3. **Examples of Atomicity**:
- For oxygen (O), it exists as a diatomic molecule (O2). Therefore, the atomicity of oxygen is 2 because there are two oxygen atoms in one molecule of O2.
- For phosphorus (P), it exists as P4. Thus, the atomicity of phosphorus is 4 because there are four phosphorus atoms in one molecule of P4.

4. **Conclusion**: The answer to the question is that the number of atoms present in a molecule of an element is known as its atomicity.

**Final Answer**: Atomicity

---