Here's how the ions in a compound of potassium and bromine would be ordered in a chemical formula and name:

1. Chemical Formula:

* Cation first: Potassium (K) is a metal, forming a positive ion (K⁺). Metals are always written first in a chemical formula.

* Anion second: Bromine (Br) is a nonmetal, forming a negative ion (Br⁻). Nonmetals are written second.

Therefore, the chemical formula is KBr.

2. Chemical Name:

* Cation name first: The name of the cation is simply "potassium."

* Anion name second: The name of the anion is "bromide."

Therefore, the chemical name is potassium bromide.