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)

Ionic bonding is the complete transfer of valence electron (s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

Potassium (K) and Flourine (F)

Ionic bond is formed when electronegativity difference between two reacting elements is high.

Here, electronegativity difference between K and F is high hence they form ionic bond.