The chemical element with the longest name is pterophore, which contains 12 letters. However, it’s worth noting that in the periodic table of elements, the longest official element name is rutherfordium with 12 letters as well.
This naming comes from the desire to honor significant contributions to science; for example, rutherfordium was named after the famous physicist Ernest Rutherford. In addition to being a noble gesture, the length of a chemical element’s name can also reflect its history and the complexity of its discovery or synthesis.