Question

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part a

which pair of atoms forms a nonpolar covalent bond?

n and o

na and f

p and h

b and f

Explanation:

• Non - polar covalent bonds occur when the electronegativity difference ($\Delta$EN) between two atoms is very small ($\Delta$EN < 0.5).
• For N (electronegativity = 3.04) and O (electronegativity = 3.44), $\Delta$EN=3.44 - 3.04 = 0.4.
• For Na (electronegativity = 0.93) and F (electronegativity = 3.98), $\Delta$EN = 3.98 - 0.93=3.05 (ionic bond).
• For P (electronegativity = 2.19) and H (electronegativity = 2.20), $\Delta$EN=2.20 - 2.19 = 0.01.
• For B (electronegativity = 2.04) and F (electronegativity = 3.98), $\Delta$EN=3.98 - 2.04 = 1.94.

Answer:

P and H