Chemistry

Question Analysis
This question involves ranking elements by electronegativity to find the lowest value. The main focus is on applying periodic trends for electronegativity across groups and periods.

Key Concept Explanation
Electronegativity decreases down a group (due to increased atomic radius and shielding) and increases across a period (left to right, due to increased nuclear charge and decreased atomic radius). Alkali metals (Group 1) have the lowest electronegativity values in their periods, with the lowest overall values at the bottom of Group 1.

Step-by-Step Solution
1. Locate each element in the periodic table:
Cs: Group 1, Period 6
Ca: Group 2, Period 4
C: Group 14, Period 2
Cl: Group 17, Period 3
2. Apply trends: Group 1 elements have lower electronegativity tha...