Chemistry

Question Analysis
This question tests the student's understanding of the trend in atomic radius across a period in the periodic table.

Key Concept Explanation
As you move from left to right across a period, the atomic radius decreases due to the increasing nuclear charge (more protons) pulling the valence electrons closer to the nucleus, while electron shielding remains constant.

Step-by-step Solution
1. Identify the trend in atomic radius across a period.
2. Recall that the increasing nuclear charge (more protons) pulls the va...