How about Honorable Mention for Lise Meitner? She only discovered Nuclear Fusion.
How about Shottkey? transistors anybody?
No question Meitner instead of Hahn. She was the physicist and he was the chemist. Hahn, despite being under the Nazis and she Jewish, sent her the results of tests done after she fled to Scandinavia. She had her Eureka moment there.
Also Niels Bohr deserves to be on the last.
And what about Giordano Bruno?