Final answer:
A positively charged potassium ion and a negatively charged fluoride ion will form an ionic bond, resulting in the formation of potassium fluoride (KF), with the ions being held together by electrostatic attraction.
Step-by-step explanation:
A positively charged potassium ion (K+) and a negatively charged fluoride ion (F-) will form an ionic bond. This type of bond happens because of the transfer of an electron from the potassium atom to the fluorine atom, completing the valence shell of both atoms. Potassium (atomic number 19) has one electron in its outer shell and fluorine (atomic number 9) has seven electrons in its valence shell, so the transfer creates a stable electronic arrangement for both.
The aforementioned electron transfer results in potassium becoming a positively charged ion and fluoride becoming a negatively charged ion. These ions are then strongly attracted to one another due to the difference in their charges, allowing for the formation of potassium fluoride (KF), a neutral compound as both ionic charges cancel each other out. This attraction is an example of electrostatic potential energy at play.