Missing VDW radius values for rarely used elements

[rbdavid]

The molcularnodes/data.py::elements dictionary contains information about elements, where the element symbols are keys to access a subdictionary for each element. The subdictionaries have keys such as 'name', 'atomic_number', 'standard_mass', and 'vdw_radii'. The vDW radii for metal atoms are poorly defined. Currently, the elements 47 and beyond do not have a 'vdw_radii' value assigned in their subdictionary. There is some literature available that reports these values but, when implementing updates to the elements dictionary, I did not have the time nor expertise to determine the validity of the literature values. Here are a few papers that I found on the subject:

https://pubs.acs.org/doi/10.1021/jp8111556

https://pubs.rsc.org/en/content/articlelanding/2013/dt/c3dt50599e

FYI, elements missing a 'vdw_radii' value will be given a default value of 100 pm. AFAIK, this attribute is used to visualize Sphere/Ball-and-stick/Surface representations of the atomic system.

[alphataubio]

vdw radius up to 99 attached. SOURCE: PubChem

PubChemElements_all.csv