Which one of the following has the highest ionic character?

  1. A. BeF_{3}
  2. B. SiO_{2}
  3. C. NCl_{3}
  4. D. K_{2}S

Correct Answer: D. K_{2}S

Explanation

Ionic character depends on the electronegativity difference between the combining atoms. K_{2}S forms between a highly electropositive alkali metal (Potassium) and a non-metal (Sulfur), yielding the highest electronegativity difference and greatest ionic character among the given options.

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