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 generally decreases. This is because the increasing nuclear charge (more protons) pulls the valence electrons closer to the nucleus, while the electron shielding effect remains relatively constant.

Step-by-step Solution
1. Identify the trend in atomic radius across a period.
2. Recall that the nuclear charge increases from left to right across a period.
3. Understand that the increased nuclear charge pulls the v...