Chemistry

Question Analysis
This question involves comparing atomic radii of elements in the same period.The main focus is on applying the periodic trend of atomic radius across a period (left to right).

Key Concept Explanation
Across a period, atomic radius decreases because the nuclear charge increases while electrons are added to the same valence shell. The stronger nuclear attraction pulls electrons closer to the nucleus.

Step-by-Step Solution
1. Identify the period: Li, Be, B, C are all in Period 2.
2. Recall the period trend: Atomic radius decreases from left to right.
3. Locate element positions: Ca...