Add atomic radii

Hello,

It would be nice to include the atomic radii, see for example https://en.wikipedia.org/wiki/Atomic_radii_of_the_elements_(data_page).
I don't know if you have an easy script to scrape and add this data @Bowserinator , otherwise I might add the data some time later since I will need it for a hobby project :)

[ElFlujo]

Oh well you can assign me to add the atomic radii, since i will be needing same. I wouldnt like to have a forked repository for that on my repos

Would be much appreciated, I haven't found the time for it myself yet :)

[ElFlujo]

Yh I need to be assigned tho, I have it ready locally