Which one of the following pairs of elements would be expected to form an ionic compound? 1. S, F 2. As, Br 3. Rb, Cl 4. C, I 5. H, C

Ionic compound : It is a type of compound that is made up of the ions of the two different elements in which one element is a metal and another element is a non-metal.

Covalent compound : It is a type of compound that is made up of the ions of the two different elements in which both the elements are non-metal.

In option 1, sulfur (S) and fluorine (F) elements form covalent compound because sulfur and fluorine elements are non-metal.

In option 2, arsenic (As) and bromine (Br) elements form covalent compound because arsenic and bromine elements are non-metal.

In option 3, rubidium (Rb) and chlorine (Cl) elements form ionic compound because rubidium is metal and chlorine is non-metal.

In option 4, carbon (C) and iodide (I) elements form covalent compound because carbon and iodide elements are non-metal.

In option 5, hydrogen (H) and carbon (C) elements form covalent compound because hydrogen and carbon elements are non-metal.

Hence, the option 3 (Rb) and (Cl) form an ionic compound.