# Orbital radius: is 3d less than 3s?

So I was studying some graphics of the representation of orbitals in terms of radial dependence. My graphic is similar to this one: https://www.google.pt/search?q=radial+dependence+of+orbitals&espv=2&biw=1280&bih=728&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi8kvOTuZvNAhWBshQKHYuNBw8Q_AUIBigB#imgrc=XTvxODPVjMkSHM%3A

Anyway, my book says that "the distance from the nucleus of the maximum value more distant from the nucleus is the radius of the orbital".

Well according to the graphic the maximum value of the orbital 3s corresponds to a greater value of the radius of the orbital than the orbital 3d. But that doesn't make sense, right? The orbital 3s should be closer to the nucleus, right?

This is making me confused I might be misreading the sentence? Can someone help me?

• Maximum value means less than nothing. It is the average value that matters. – Ivan Neretin Jun 9 '16 at 18:26
• Sorry I didn't understand what you mean can you please elaborate more? – Granger Obliviate Jun 9 '16 at 19:12