# What is the size of the ammonium ion?

I did an experiment in which I dissolved certain substances in water, measured the conductivity and compared that with the ion-radius. One of the things I dissolved was $\ce{NH4Cl}$. What should I use as the ion-radius for $\ce{NH4}$, since it is not really one atom?

• I finally found it :D It is 148 m^-12 – Eowyn12 Dec 7 '15 at 13:11