Is potassium iodide an ionic or covalent compound
The Correct Answer and Explanation is:
Potassium iodide (KI) is an ionic compound. This is because it is formed by the electrostatic attraction between positively charged potassium ions (K+) and negatively charged iodide ions (I-). The formation of KI occurs through the transfer of an electron from potassium (K) to iodine (I). Potassium has one electron in its outermost shell and is very likely to lose this electron to achieve a stable electron configuration, resembling the noble gas argon. Once potassium loses the electron, it becomes a positively charged ion (K+).
On the other hand, iodine, which has seven electrons in its outermost shell, gains the electron lost by potassium. This gives iodine a complete outer shell, achieving a stable electron configuration similar to that of the noble gas xenon. The resulting iodide ion (I-) has a negative charge due to the extra electron. The oppositely charged ions (K+ and I-) are held together by the strong electrostatic force of attraction, known as an ionic bond.
In ionic compounds like KI, the ions arrange themselves in a repeating pattern to form a crystal lattice. This structure maximizes the attraction between oppositely charged ions and minimizes repulsion between similarly charged ions. Ionic compounds generally have high melting and boiling points, are soluble in water, and conduct electricity when dissolved or molten due to the movement of ions.
In contrast, covalent compounds are formed by the sharing of electrons between atoms, rather than the transfer of electrons. However, potassium iodide does not involve electron sharing but rather electron transfer, confirming its classification as an ionic compound.
