Question

Question was provided via image upload.

Explanation:

Step1: Analyze \( CO_2 \)

In \( CO_2 \), the sub - script of \( C \) is \( 1 \) (implied if not written), and the sub - script of \( O \) is \( 2 \).

Step2: Analyze \( H_2O \)

In \( H_2O \), the sub - script of \( H \) is \( 2 \), and the sub - script of \( O \) is \( 1 \) (implied if not written).

Answer:

For \( CO_2 \): \( 1 \) carbon atom and \( 2 \) oxygen atoms.
For \( H_2O \): \( 2 \) hydrogen atoms and \( 1 \) oxygen atom.