As the physics of nuclear explosives has not changed, pretty much the same elements as are used now. The main changes are not the elements, but the compounds that contain them (e.g. the chemical explosives have been replaced with safer ones, but both the old and new chemical explosives contain the same elements just in different arrangements.
Polonium is an element used in the neutron sources of all 4 atomic bombs built during World War 2 (Gadget, Little Boy, Fat Man, and an unnamed bomb that was never used) that is no longer used in modern nuclear explosives. Polonium based neutron sources have a shelf life of roughly 180 days due to radioactive decay. These were replaced by electrically activated tritium fusion based neutron sources sometime in the middle 1950s which have a shelf life of roughly 12 years due to radioactive decay.
Lithium is an element used in some modern nuclear explosives that was not used in world war 2, it is converted to tritium in those bombs for use as fusion fuel. The first use of lithium in a nuclear explosive was in 1953 by the USSR.
It is important to realize that many many elements other than the nuclear fuels must be used in a nuclear explosive to make it work.
The world was going through world war two. The atomic bomb ended the war.
The atomic bomb was dropped on Hiroshima in World War 2
the atomic bomb was made to end the world war 2
the atomic bomb was created to end the world war 2!!
it was called the "fatman" atomic bomb
The Second World War.
The atomic bomb was dropped on Hiroshima and Nagasaki in World War 2.
No, the atomic bomb was first used in 1945.
No, Albert Einstein did not built an atomic bomb to end World War I
It was the Atomic bomb.
It was used in the world war two, its an atomic bomb!
The atomic bomb .
the atomic bomb
The atomic bomb was sopower full that japan surrendered a couple days after the second bomb. This nuclear weapon is what led World war II to an end. Not World war I
The atomic bomb had no effects on WW1 at it did not exist.
at the end of the world war (WW2) the atomic bomb was used on Hiroshima and Nagasaki. After WW2 the atomic bomb was further developed and "was used as a silent threat against USSR" until 1949 when they had their own atomic bomb. From that year there was an arms race which played a major part in the Cold War
It ended World War 2.
That was World War Two.
the atomic bomb played a key role in ending world war II,the atomic bomb created via the Manhattan Project.
There were 11 American prisoners of war killed by the atomic bomb.
The Atomic bomb .
The second atomic bomb hit Nagasaki by the Americans during the 2 world war