Answer:
The chemical formula for an ionic compound formed from potassium (K) and bromine (Br) is C. KBr.
In an ionic compound, the positive and negative charges must balance out. Potassium has a positive charge of +1, and bromine has a negative charge of -1. To balance these charges, one potassium ion (K+) combines with one bromine ion (Br-) to form a neutral compound.
So, the chemical formula for this compound is KBr, with the subscript 1 implied. The subscript 1 indicates that there is only one potassium ion and one bromine ion in the compound.
Option A (K₁Br₁) also represents the correct formula, but the subscript 1 is not necessary and can be omitted.
Option B (BrK) is not the correct chemical formula since the symbol for the metal (potassium) usually appears first in an ionic compound.
Option D (Br₂K) is incorrect because it suggests that there are two bromine ions and one potassium ion, which does not balance the charges properly.
Therefore, the correct answer is C. KBr.
Step-by-step explanation: