Chemistry

Question Analysis
This question involves identifying the most electronegative element in Period 3 using periodic trends. The main focus is on applying the period trend of electronegativity (left to right increase).

Key Concept Explanation
Electronegativity increases across a period (left to right) due to increasing nuclear charge and decreasing atomic radius.
Noble gases (e.g., Ar in Period 3) have very low electronegativity, so the rightmost reactive element in Period 3 has the highest value.

Step-by-Step Solution
1. List Period 3 elements in order (left to right): Na, Mg, Al, Si, P, S, Cl, Ar.
2. Apply the period trend: electronegativity incre...