Oxygen nitrogen cerium- thorium erbium e- tungsten arssenic- a nitrogen- uranium g l yttrium- barium radon actinium l e. Helium- tungsten arssenic- sulfur oxygen- uranium g l yttrium- e vanadium erbium yttrium oxygen neon- d iodine e d-. What did I say? '-' represents the end of the word, and singular letters just mean that letter.