In standard color conventions for ball-and-stick models, which color and bond count correctly matches oxygen?

In standard color conventions for ball-and-stick models, which color and bond count correctly matches oxygen?

• A. Red; 2 bonds
• B. White; 1 bond
• C. Blue; 3 bonds
• D. Black; 4 bonds

Answer: (A)

In ball-and-stick models, colors and bond counts reflect common valences to help you recognize atoms and how they typically bond. Oxygen is colored red and usually forms two bonds because it has six valence electrons and needs two more to complete its octet. This is why, in everyday molecules like water, oxygen shows up with two bonds. By contrast, white represents hydrogen (usually one bond), blue represents nitrogen (usually three bonds), and black represents carbon (usually four bonds). So the pairing of red with two bonds best matches oxygen’s usual bonding pattern.

In ball-and-stick models, colors and bond counts reflect common valences to help you recognize atoms and how they typically bond. Oxygen is colored red and usually forms two bonds because it has six valence electrons and needs two more to complete its octet. This is why, in everyday molecules like water, oxygen shows up with two bonds. By contrast, white represents hydrogen (usually one bond), blue represents nitrogen (usually three bonds), and black represents carbon (usually four bonds). So the pairing of red with two bonds best matches oxygen’s usual bonding pattern.