The word "certium" may seem a bit unfamiliar, and its spelling can be a bit tricky to understand. However, by examining its IPA phonetic transcription, the confusion can be easily cleared. The correct spelling is actually "cerium", with the phonetic transcription /ˈsɪəriəm/. This chemical element has the atomic number 58 and the symbol Ce. It is a silvery-white metal that is widely used in electronics and as a catalyst in industry. With a proper understanding of the correct spelling and pronunciation, you can confidently use the word "cerium" in any context.