Chemistry

Question Analysis
This question assesses the ability to arrange elements in order of decreasing atomic radius based on their position in the periodic table.

Key Concept Explanation
Atomic radius generally decreases as you move from left to right across a period and increases as you move down a group. Elements in the same period will have their atomic radii decrease from left to right.

Step-by-step Solution
1. Identify the elements: Rubidium (Rb), Strontium (Sr), Yttrium (Y), and Zirconium (Zr).
2. Determine their positions in the periodic table: Rb (Group 1), Sr (Group 2), Y (Group 3), and Zr (Group 4).
3. Apply the trend: atomic radius decreases from left to right...