1-18 Differentiate and predict ionic and covalent bonding

1-18-1. Which of the following pairs of atoms is most likely to form an ionic bond?
A. C and H, B. Ca and H, C. Hg and Hg

1-18-2. What type of bond is more likely between a carbon atom and an oxygen atom?
A. ionic, B. covalent, C. metallic