Final answer:
Potassium chloride (KCl) is the correct answer as it is a binary ionic compound featuring potassium, which is a Type I metal.
Step-by-step explanation:
To determine which of the given formulas represent a binary ionic compound with a Type I metal, we need to understand what Type I metals are and what defines a binary ionic compound. Type I metals are those metals that form ions with a predictable charge, which generally includes the Group 1 (alkali metals) and Group 2 (alkaline earth metals) elements of the periodic table, as well as a few other metals like Ag+, Cd2+, and Zn2+. A binary ionic compound consists of two elements: one metal and one nonmetal. The metal cation has a positive charge, and the nonmetal anion has a negative charge.
Looking at the provided options:
- a) NO - Nitric oxide is a covalent compound, not an ionic compound.
- b) CrCl₃ - Chromium chloride is ionic, but chromium is not a Type I metal.
- c) SO₂ - Sulfur dioxide is a covalent molecular compound, not ionic.
- d) KNO₃ - Potassium nitrate is ionic but not binary (contains more than two elements).
- e) KCl - Potassium chloride is a binary ionic compound with potassium (Type I metal) forming the cation K+ and chlorine forming the anion Cl-.
Therefore, the formula KCl represents a binary ionic compound with a Type I metal.