None, nobody had either the material or infrastructure to do so.
2
7 :)
As both atomic bombs and supernovas vary in yield, this question has no single answer.
Atomic bombs- Zero.
2
100
Many atomic bombs were detonated for "test" purposes. Fortunately none were used in war.
2 atomic bombs and 2 million HE bombs and 5 million incendiary fire bombs
So you could level more than one city and pose a larger threat
1 WW2 was the only war to detonate atomic bombs. Pray no one ever uses any again.
Because the atomic bombs killed many more Japanese civilians than it did military personel.
Atomic bombs have only been used in combat twice. The US dropped two bombs, one on Nagasaki, one on Hiroshima.