Add historical group numbers - Won't Fix
Display the groups using IA, IIA, etc
AdminMichael Dayah (Admin, Lucent) commented
Old group numbers were scrapped by IUPAC 30 years ago because America had
one and Europe had another and they were contradictory. That would be very
confusing for an international audience as VA is group 15 in the USA and
group 4 in the EU.