Which element could chlorine bond with to form an ionic compound?

helium

oxygen

fluorine

sodium

The answer to this is sodium. Sodium has 1 electron in its outermost shell, and chlorine has 7 electrons. it is easiest for sodium to loses its electrons and form a + 1 ion, and for chlorine to gain an electron, forming a - 1 ion.

Sodium. It'll make sodium chloride or NaCl or table salt.