Which one of the following is more fundamental property of an element than its

Options

A. atomic number
B. atomic mass
C. atomic radius
D. electronic configuration

Answer

To determine which property of an element is more fundamental than others, we need to analyze the options provided in the question. However, since the options are not specified, we will focus on the fundamental properties of elements in general.

### Step-by-Step Solution:

1. **Understanding Atomic Number**:
- The atomic number of an element is defined as the number of protons present in the nucleus of an atom. It is a unique identifier for each element.
- For example, hydrogen has an atomic number of 1, meaning it has one proton.

2. **Modern Periodic Law**:
- The modern periodic law states that the properties of elements are a periodic function of their atomic numbers. This means that when elements are arranged in order of increasing atomic number, elements with similar properties appear at regular intervals.
- This was established by Henry Moseley, who showed that atomic number is a more fundamental property than atomic mass.

3. **Comparison with Other Properties**:
- Other properties of elements, such as atomic mass, electron configuration, or physical state, are influenced by the atomic number but are not fundamental in the same way.
- For instance, isotopes of an element have the same atomic number but different atomic masses.

4. **Conclusion**:
- Therefore, the atomic number is the most fundamental property of an element because it determines the identity of the element and influences its chemical behavior.

### Final Answer:
The most fundamental property of an element is its **atomic number**.