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no Kennedy decided
The same nuclear radiation is released by both fission (atomic) and fusion (hydrogen) bombs. Hydrogen bombs are larger, and produce more.
plutonium
Yes, atomic bombs are made with chemicals and elements that contain radio-activity.
Since 1945 eight countries have produced atomic bombs. There is no major secret. Any country sized entity that decides to produce atomic bombs can typically do so within 4 years after the decision.
The key elements to making fission bombs are: Uranium and Plutonium. The specific isotopes of interest are: Uranium-233, Uranium-235, and Plutonium-239. But many other elements are needed to make a functional bomb. As a very rough guess, about a quarter of the elements on the periodic table are needed somewhere in the bomb, roughly 23 different elements in total.
At this time (2012), none. Neither does Russia. Existing bombs are just refurbished.
Atomic bombs contain uranium (highly enriched in the isotope 235U) or plutonium (a very specific isotopic composition).
The United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki. Both targets were military (Hiroshima contained a significant military HQ, and Nagasaki a substantial naval base). However, the target cities were also chosen to show off the massive amount of damage the atomic bomb could produce, which inevitably meant causing huge numbers of civilian deaths.
More & higher yield atomic bombs, I guess.
Yes, uranium can be used in atomic bombs.
Atomic bombs were dropped in WWII