Alithium atom has three electrons. a fluorine has 9 protons and 9 electrons, with 7 electrons in its outer energy level. using a diagram, explain how an atom of lithium an an atom of fluorine combine by ionic bonding

The lithium atom has one electron in its outer shell, so it loses that one electron and becomes a ion. The fluorine atom has 7 electrons in its outer shell so it gains that one electron and becomes a ion. The electrostatic force of attraction between the two ions, because of their charges, bonds them together in an ionic bond to make , Lithium Fluoride.

Couldn't add a diagram, but hope it helps.

they are all solids.