Question

when sodium atoms (na) and chlorine atoms (cl) join to make sodium chloride, or table salt, they form an ionic bond. using this information, which pair of elements is most likely to form an ionic bond?
potassium (k) and fluorine (f)
aluminum (al) and aluminum (al)
sulfur (s) and oxygen (o)
calcium (ca) and neon (ne)

Explanation:

Ionic bonds form between a metal and a non - metal. Potassium (K) is a metal (alkali metal) and fluorine (F) is a non - metal (halogen).
Aluminum (Al) and aluminum (Al) would form a metallic bond as it is the same metal.
Sulfur (S) and oxygen (O) are both non - metals and would form a covalent bond.
Calcium (Ca) is a metal but neon (Ne) is a noble gas which is very stable and does not readily form bonds.

Answer:

Potassium (K) and fluorine (F)