On moving from left to right across a period in the periodic table the metallic character

Options

A. Decreases
B. Increases
C. Remains constat
D. First increases and then decreases

Answer

To solve the question regarding the change in metallic character as we move from left to right across a period in the periodic table, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Metallic Character**:
- Metallic character refers to the tendency of an element to lose electrons and form positive ions (cations). Elements that exhibit metallic character are typically good conductors of heat and electricity, and they tend to be malleable and ductile.

2. **Identifying the Trend Across a Period**:
- In the periodic table, elements are arranged in periods (horizontal rows) and groups (vertical columns). As we move from left to right across a period, we encounter different elements with varying properties.

3. **Ionization Energy**:
- Ionization energy is the amount of energy required to remove an electron from an atom. As we move from left to right across a period, the ionization energy generally increases. This is due to the increasing nuclear charge (more protons) which attracts the electrons more strongly.

4. **Effect on Electropositive Character**:
- Electropositive character is the ability of an element to lose electrons. Since ionization energy increases, it becomes more difficult for elements to lose electrons as we move from left to right. Therefore, the electropositive character decreases.

5. **Linking Electropositive Character to Metallic Character**:
- Since metallic character is directly related to electropositive character, a decrease in electropositive character means that the metallic character also decreases.

6. **Conclusion**:
- Thus, as we move from left to right across a period in the periodic table, the metallic character decreases.

### Final Answer:
- The correct option is **Option 1: Decreases**.