Question

in naming the compound pcl₅, the prefix used for the second element is

Explanation:

Step1: Recall naming rules for molecular compounds

In molecular compound naming, prefixes indicate the number of atoms.

Step2: Identify the number of chlorine atoms

The formula is \(PCl_{5}\), there are 5 chlorine atoms.

Step3: Determine the prefix for 5

The prefix for 5 is "penta -".

Answer:

penta -