Answer:
its a chemical formula, it has numbers and symbols
Propylethylene would be the answer
I am assuming you are talking about Neon. The rate of diffusion is directly proportional to the molar mass of the gas. Since neon has a molar mass of 20.18 grams, the gas must have a lower molar mass and must be a gas at 273 Kelvin. There are several elements that fulfill this criteria: Hydrogen, Helium, Oxygen, Nitrogen, and Fluorine.
This link might help you!!
https://www.eiu.edu/biology/bio1500/writing_a_lab_report.pdf