The option which describes something that causes ionic bonds to form is: large electronegativity differences.
A chemical bond refers to the forces of attraction that exist between ions, crystals, atoms or molecules and as such are typically responsible for the formation of new chemical compounds.
Basically, a chemical bond is a force that holds atoms of chemical elements together and binds crystals, ions or molecules together, so as to form a chemical compound.
In Chemistry, there are three (3) main types of chemical bonds and these are:
An ionic bond can be defined as a type of chemical bond that usually involves a metallic element transferring one or more electrons to a non-metallic element.
In order for a metallic element to transfer one or more electrons to a non-metallic element, there must be a large electronegativity differences between their atoms.
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