#1164 Atom types with missing information

[Egon Willighagen]

The following atom types have incomplete information:

Al.3plus
Al
Ar
Ca.2plus
Co.2plus
Co.3plus
Co.metallic
Cr
Cu.2plus
Fe.2plus
Ga.3plus
Ga
He
Hg.minus
K.plus
K.metallic
Kr
Mg.2plus
Mn.2plus
Ne
Ni.2plus
Ni
Po
Pt.2plus
Pt.4
Pt.6
Rn
Sc.3minus
Ti.3minus
V.3minus
W.metallic
Xe
Zn
Zn.2plus