In modern periodic table,the basic character of oxides

Options

A. Decreases from left to right increases from bottom to top
B. Increases from left to right and decreases from top to bottom
C. Decreases from right to left and increases from top to bottom
D. Decreases from left to right and increases from top to bottom

Answer

To solve the question regarding the basic character of oxides in the modern periodic table, we need to analyze the trends in basicity as we move across periods and down groups.

### Step-by-Step Solution:

1. **Understanding Basic Character**:
- Basic character refers to the ability of an oxide to react with acids and form salts and water. Basic oxides are typically formed by metals.

2. **Periodic Trends**:
- In the periodic table, as you move from left to right across a period, the elements become more electronegative. This means that nonmetals (which form acidic oxides) are more prevalent on the right side, while metals (which form basic oxides) are more prevalent on the left side.

3. **Basic Character Across a Period**:
- As we move from left to right in a period, the basic character of oxides decreases. This is because the metals on the left (which form basic oxides) are replaced by nonmetals on the right (which form acidic oxides).

4. **Basic Character Down a Group**:
- As we move down a group in the periodic table, the basic character of oxides increases. This is because the metals become more electropositive, meaning they are more willing to donate electrons and thus form more basic oxides.

5. **Conclusion**:
- Therefore, we can summarize that the basic character of oxides decreases from left to right across a period and increases from top to bottom down a group.

6. **Final Answer**:
- The correct statement regarding the basic character of oxides in the modern periodic table is: "Basic character decreases from left to right and increases from top to bottom."