Chemistry

Question Analysis
This question tests the student's understanding of the trend in atomic radius as you move down a group in the periodic table.

Key Concept Explanation
As you move down a group, the atomic radius generally increases due to the addition of new electron shells, which outweighs the increased nuclear charge.

Step-by-step Solution
1. Identify the group in question: Group 1 (alkali metals).
2. Recall the trend for atomic radius in a group: atomic radius increases as you move down the group.
3. The reason is the ...