Since sodium (Na) and chlorine (Cl) form an ionic bond by transferring electrons to form positively and negatively charged ions, the pair of elements most likely to bond in a similar manner are those that have a significant difference in their electronegativity values, allowing for easy transfer of electrons.

Here are some possible pairs of elements that are likely to form ionic bonds:

1. Lithium (Li) and Fluorine (F): Lithium is a highly electropositive metal, while fluorine is a highly electronegative nonmetal. This difference in electronegativity makes it likely for lithium to transfer its valence electron to fluorine, forming an ionic bond.

2. Calcium (Ca) and Oxygen (O): Calcium is a moderately electropositive metal, and oxygen is a moderately electronegative nonmetal. The difference in electronegativity between calcium and oxygen is still significant, making it likely for calcium to transfer its valence electrons to oxygen, forming an ionic bond.

3. Potassium (K) and Iodine (I): Potassium is a moderately electropositive metal, while iodine is a highly electronegative nonmetal. The difference in electronegativity between potassium and iodine is substantial, making it likely for potassium to transfer its valence electron to iodine, forming an ionic bond.

These pairs of elements are likely to form ionic bonds because the electronegativity difference between them is significant, leading to the transfer of electrons and the formation of positively and negatively charged ions.