Elements of the Periodic Table with just enough Letters: 3 Minute Sprint

This is a different, speed, version of the Elements of the Periodic Table quiz. For each element, you only have to type enough letters so that they are not also the starting letters of any other element. For example, if you took an imaginary quiz having three answers, namely Redland, Bluestan and Blackia, then R, BLU and BLA would be correct answers, but B and BL would not be, because they are starting letters of more than one answer. You have three minutes. Good luck!