Chemistry

Question Analysis
This question involves the judgment of chemical bond types based on the types of bonded elements. The main focus is on identifying the element pair that meets the formation condition of ionic bonds.

Key Concept Explanation
Ionic bonding typically occurs between a metal and a nonmetal, where the metal loses electrons to become a cation and the nonmetal gains electrons to become an anion.

Step-by-step Solution
1. Recall the conditions for ionic bonding: Typically metal and nonmetal combination.
2. Identify the elements in each pair: C and H, N and O, S and O...