On moving from left to right in periodic table, which of the following properties is increases?

Options

A. Atomic radius
B. Valency
C. Metallic character
D. Atomic number

Answer

To answer the question regarding which property increases when moving from left to right in the periodic table, we can analyze the trends in the periodic table step by step.

### Step-by-Step Solution:

1. **Understanding the Periodic Table**: The periodic table is organized in such a way that elements are arranged in order of increasing atomic number from left to right across a period.

2. **Atomic Number**: As we move from left to right in a period, the atomic number of the elements increases. This is because each successive element has one more proton in its nucleus than the previous one.

3. **Atomic Radius**: The atomic radius generally decreases as we move from left to right across a period. This is due to the increasing positive charge in the nucleus, which pulls the electrons closer to the nucleus.

4. **Valency**: The valency of elements can increase and then decrease across a period. However, it does not consistently increase throughout the entire period.

5. **Metallic Character**: The metallic character of elements decreases as we move from left to right. This is because elements on the left side of the periodic table are metals that tend to lose electrons easily, while those on the right are non-metals that tend to gain or share electrons.

6. **Conclusion**: The property that consistently increases when moving from left to right in the periodic table is the **atomic number**.

### Final Answer:
The property that increases on moving from left to right in the periodic table is the **atomic number**.

---