A very useful and interesting link.
A nit which can be picked is the suggestion that
Tc should have a split source coloring because all of that element which
is used is man made.
In a message dated 1/26/2016 6:39:05 A.M. Mountain Standard Time,
alapinski@pds.org writes:
My chemistry colleague sent this to me. It's yesterday's (1-25-16)
Astronomy Picture Of The Day, showing where all the elements came from.