Question

1. which of the following pairs of elements is most likely to form an ionic bond?

a. carbon and oxygen
b. hydrogen and chlorine
c. sodium and chlorine
d. nitrogen and hydrogen

Explanation:

Ionic bonds form between a metal and a non - metal. Sodium (Na) is a metal (from Group 1 of the periodic table) and chlorine (Cl) is a non - metal (from Group 17 of the periodic table). In option A, carbon (C) and oxygen (O) are both non - metals (form covalent bonds). In option B, hydrogen (H) and chlorine (Cl) are non - metals (form covalent bonds). In option D, nitrogen (N) and hydrogen (H) are non - metals (form covalent bonds).

Answer:

C. Sodium and chlorine