Respuesta :
When a metal react with a halogen, the metal tend to lose atom and the halogen tend to accept an atom. Hence, a metal and a halogen forms an ionic bond.
The lithium is a metal and fluorine is a halogen, the lithium donate an electron and the fluorine accepts an atom, and forms an ionic bond, which result in the formation of lithium fluoride.
Hence, the correct answer is:
c. They form an ionic compound.
