Space Quest (4/20)

Hello During the space quest:

task 3 asks you to enter the Sci-fi Drive in - COMPLETE
task 4 asks you to collect 5 atoms - I've found 4 is there one hidden in the room?
(1- to the right of the screen, 2- in the middle of the cars, 3 top of the room under poster, 4, under projection light. I can't find the 5th to complete the task!