Chemistry

Question Analysis
This question assesses the student's ability to use the electronegativity difference (ΔEN) to predict the type of chemical bond formed between two elements and to apply this concept with specific examples.

Key Concept Explanation
Electronegativity difference (ΔEN) is a measure of how unequally electrons are shared between two atoms in a bond. The magnitude of ΔEN determines bond type:
ΔEN = 0–0.4: Nonpolar covalent (electrons shared nearly equally)
ΔEN = 0.4–1.7: Polar covalent (electrons shared unequally)
ΔEN > 1.7: Ionic (electrons transferred from low EN to high EN atom)
A larger ΔEN corresponds to a stronger polarity or ionic character, while a smaller ΔEN corresponds to a less polar or nonpolar bond.

Step-by-step Solution
1. Define the ΔEN: The difference in electronegativity between two elements.
2. Determine the criteria: If ΔEN > 1.7, the bond is ionic; if ΔEN < 1.7, the bond is covalent.
3. Use an example: Sodium (Na) has an electronegativity of 0.93, and chlorine (Cl) has an electronegativity of 3.16.
4. Calculate...