Question

On moving from right to left across the period of the modern periodic table, the atomic size:

• A. Increases
• B. Decreases
• C. Remains unchanged
• D. None of these

Hint:

Across a period (left to right), atomic size decreases due to increasing nuclear charge, which pulls electrons closer to the nucleus.

Answer 1

The Correct Option is B

Step 1: Understanding atomic size trends. As we move from left to right across a period in the periodic table: - The atomic number increases, leading to a greater nuclear charge. - The increased attraction between electrons and the nucleus reduces atomic radius.
Step 2: Explanation of incorrect options.
- Increases: Incorrect, as atomic size actually decreases.
- Remains unchanged: Atomic size varies across periods, so this is incorrect.
- None of these: Incorrect, as a clear trend exists.