Questions like these come down to personal opinion. One might argue that it was a need, where one might argue it was a greed. There is no "correct" answer.
Most people don't think so.
See: Atomic bombing of Hiroshima and Nagasaki
The bombing of Hiroshima was only one bomb. It was the atomic bomb called little boy.
atomic bombing of hiroshima
See: Atomic bombings of Hiroshima and Nagasaki.
See: Atomic bombings of Hiroshima and Nagasaki
Yes. Atomic and nuclear have the same meaning.
Hiroshima was a large city. Several hundred thousand people were "in" the bombing. You need to be more specific in your question.
Yes. The Atomic bombing of Nagasaki, after Hiroshima, is the final act of WW2
To end the war.
Hiroshima
Hiroshima and Nagasaki were two in Japan.