Chemistry

Question Analysis
This question evaluates the student's understanding of periodic trends in electronegativity and their ability to arrange elements in order of decreasing electronegativity.

Key Concept Explanation
Electronegativity generally increases across a period from left to right.
In the second period, carbon (C, atomic number 6), nitrogen (N, atomic number 7), and oxygen (O, atomic number 8) are arranged in increasing atomic number.
Therefore, oxygen (O) has the highest electronegativity, followed by nitrogen (N), and then carbon (C).

Step-by-step Solution
1. Identify the elements’ positions in Period 2: C (Group 14), N (Group 15), O (Group 16).
2. Apply t...