Which periodic group has the SMALLEST atomic radius?

Step 1: Define the Problem

Identify which periodic group has the smallest atomic radius.

Step 2: Break Down the Problem

1. Understand the trend of atomic radius in the periodic table.
2. Identify the group with the smallest atomic radius based on this trend.

Step 3: Apply Relevant Concepts

• Atomic radius generally decreases across a period from left to right due to increasing nuclear charge.
• Atomic radius generally increases down a group due to the addition of electron shells.

Step 4: Analysis, Verify and Summarize

• The smallest atomic radius is found in the top right of the periodic table.
• Group 18 (Noble Gases) is typically excluded when considering atomic radii trends because they are often measured differently.
• Therefore, Group 17 (Halogens) has the smallest atomic radius among the main groups.

Final Answer

Group 17 (Halogens) has the smallest atomic radius among the periodic groups.