# What is the meaning of the prefix “per-”?

The prefix "per-" appears in the names of many compounds, such as in perchlorate, persulfate, peroxide. What does it mean?

• See my comment in the thread under my answer here. – Todd Minehardt Nov 9 '15 at 14:12

• @Jan The preferred IUPAC name for perfluoroheptane $(\ce{C7F16})$ is hexadecafluoroheptane. Note that all locants are omitted, i.e. the name is not 1,1,1,2,2,3,3,4,4,5,5,6,6,7,7,7-hexadecafluoroheptane. – Faded Giant Nov 9 '15 at 13:27