Question

What is the electronegativity difference for a bond between potassium and iodine? A. 3.3 B. 4.6 C. 0.4 D. 1.7

Answer 1

Answer is: D. 1.7.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons. Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.  

When the electronegativity difference is greater, the bond polarity is increasing.

Δχ(K-I) = 2.5 - 0.8.

Δχ(K-I) = 1.7; the electronegativity difference for a bond between potassium and iodine.

Answer 2

Iodine has an electronegativity of 2.5, and potassium has an electronegativity of 0.8, so the difference is:
2.5 - 0.8 = 1.7