The Science Fiction author H. G. Wells did and wrote about them in his 1914 novel The World Set Free.
Because the atomic bombs killed many more Japanese civilians than it did military personel.
Both atomic bombs dropped on Japan were successful. What gave you the idea they weren't?
No.
The order came from President Truman.
More & higher yield atomic bombs, I guess.
Atomic bombs were dropped in WWII
Yes, uranium can be used in atomic bombs.
Total war means atomic bombs.
During WWII the atomic bombs were dropped in Hiroshima and Nagasaki
No. The US gave them cryptic messages about the bombs and never told them they had atomic bombs.
H. G. Wells thought of them and coined the term "atomic bomb" for his 1914 novel The World Set Free. However he had no idea how they might work.Leo Szilard invented the process of the neutron chain reaction in 1933 and patented it in 1934 with claims for its use in atomic bombs and reactors. However he had no idea what material(s) might be suitable to support the neutron chain reaction.The work of Otto Hahn and Fritz Strassmann, in Germany and Lise Meitner and Otto Robert Frisch, in Sweden showed in January 1939 that uranium fissioned when struck by neutrons. Thus it might be a suitable material for making atomic bombs.
Their energy came from that stored in matter (E=MC2) rahter than that stored in chemical bonds.