Periodic Table +

with country and date of discovery.

[Source:https://www.reddit.com/r/dataisbeautiful/comments/6muapc/the_periodic_table_with_country_and_date_of/?st=J52DWTMP&sh=82b14757&utm_content=buffer7c9b7&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer ]