(no subject)

The history of chemistry:


Red: medieval alchemy: the seven 'planetary' metals and two of the Tria Prima -- mercury is both and salt isn't an element.

Black: Dalton's 36 elemental symbols, except for those included above

Gray: modern symbols for the remaining elements.

Thanks to Bob LeSuer, https://community.wolfram.com/groups/-/m/t/1098055 for the base