Question

given their electronegativity values, which pair of atoms could form a covalent bond?
a. o (3.5) and cl (3.0)
b. mg (1.2) and o (3.5)
c. f (4.0) and li (1.0)
d. al (1.5) and f (4.0)

Explanation:

Step1: Calculate electronegativity difference

For a covalent bond, the electronegativity difference ($\Delta EN$) between two atoms should be less than \(1.7\).

• For option A: $\Delta EN=|3.5 - 3.0|= 0.5$
• For option B: $\Delta EN=|3.5 - 1.2|=2.3$
• For option C: $\Delta EN=|4.0 - 1.0|=3.0$
• For option D: $\Delta EN=|4.0 - 1.5|=2.5$

Answer:

A. O (3.5) and Cl (3.0)