Final answer:
Potassium bromide is an ionic compound with the chemical formula KBr, formed by combining potassium (K) and bromide (Br) ions in a one-to-one ratio.
The correct answer is: a. KBr.
Step-by-step explanation:
The formula of the compound Potassium bromide is KBr.
Potassium bromide (KBr) is composed of a potassium ion (K⁺) and a bromide ion (Br⁻). In ionic compounds, the metal (potassium) provides a positive ion, while the nonmetal (bromine) contributes a negative ion. The balanced combination of these ions forms a neutral compound.
Each potassium ion has a +1 charge, and each bromide ion has a -1 charge, resulting in a one-to-one ratio. Thus, the correct chemical formula for potassium bromide is KBr, reflecting the balanced charges of the ions and the compound's overall electrical neutrality.
The correct answer is: a. KBr.