Question

What is the combining ratio of potassium with bromine?

Answer 1

1:1 They would have one of each per molecule

Answer 2

Answer:  1: 1

Explanation:

An ionic bond is formed when an element completely transfers its valence electron to another element. This bond is formed between a metal and a non-metal.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here potassium forms a cation $K^+$ ion by loss of one electron and bromine forms an anion $Br^-$ by gain of one electron.Thus one $K^+$ combine with one $Br^-$ to form neutral $KBr$.