Which of the following does not reflect periodicity of elements ?

Options

A. Bonding behaviour
B. `EN`
C. `IE`
D. Neutron`//`proton ratio

Answer

To determine which of the following does not reflect periodicity of elements, we need to understand the concept of periodicity itself. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understand Periodicity**: Periodicity refers to the repetition of properties of elements when they are arranged in increasing order of atomic number. This means that certain properties, such as electronegativity, ionization energy, and atomic radius, show a predictable pattern or trend.

**Hint**: Remember that periodicity is based on the arrangement of elements in the periodic table.

2. **Identify Properties Related to Periodicity**: Properties that reflect periodicity are generally those that depend on the electronic configuration of the elements. This includes:
- Electronegativity
- Ionization energy
- Atomic radius

**Hint**: Focus on properties that are influenced by the arrangement of electrons in an atom.

3. **Consider the Neutron-Proton Ratio**: The neutron-proton ratio is a property that relates to the nucleus of an atom. It is not directly influenced by the electronic configuration of the element and does not show a predictable pattern across the periodic table.

**Hint**: Think about whether the property is related to the nucleus or the electrons when determining periodicity.

4. **Conclusion**: Since the neutron-proton ratio does not reflect periodicity (as it is related to the nucleus and not the electronic configuration), it is the correct answer to the question.

**Final Answer**: The property that does not reflect periodicity of elements is the **Neutron-Proton ratio**.