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## Homework Statement

The pressure inside a tank of neon is 150 . The temperature is 25C.

how many atomic diameters does a neon atom move between collisions?

## Homework Equations

I used the number density N/V=p/KbT and the mean free path equation, where pressure is in pasquals, and tried both that the atomic radius is 0.5 x 10^-10 m and then searched and found that the atomic radius of neon is 3.8 x 10-11 m and am wondering if this is my problem...not understanding the radius/diameter of neon.