* Helium (He) is a noble gas. Noble gases have a full outer shell of electrons, making them extremely stable and unreactive. They don't readily gain or lose electrons to form ions.
* Chlorine (Cl) is a nonmetal and tends to gain one electron to achieve a full outer shell, forming a chloride ion (Cl⁻).
For an ionic compound to form, one element needs to lose electrons (forming a cation) and another needs to gain electrons (forming an anion). Helium's extreme stability prevents it from losing electrons, so it cannot form a cation.
Therefore, helium and chlorine cannot form an ionic bond.
