Question

At stp which gas will diffuse more readily than ne

Answer 1

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. 

Answer 2

Hello!

I believe the gas that will diffuse more readily than neon is: Helium.