Radon Rn Atomic Number: Since the Hindenburg disaster in ,  helium has replaced hydrogen as a lifting gas in blimps and balloons due to its lightness and incombustibility, despite an 8. Avrorin, V. No tricks, just difficult words. The noble gases are used in excimer lasers , which are based on short-lived electronically excited molecules known as excimers. Focal Press. USD Excimer lasers have many industrial, medical, and scientific applications. Physical Review C. Each design has been copied on to a special film that can only be transferred on to natural materials.