Chapter 2 - Section 2.7 - Molecules and Molecular Compounds - Checkpoint - Page 69: 2.7.3

c)

If the first element has no prefix, then we know that there is only one atom of that element in the compound. In carbon tetrachloride, we know that there is only one atom of carbon. The prefix for the second element is "tetra," which means "four." Therefore, we have four atoms of chlorine. The correct formula for carbon tetrachloride is CCl$_{4}$.