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atomic bomb or A-bomb, weapon deriving its explosive force from the release of nuclear energy through the fission (splitting) of heavy atomic nuclei.The first atomic bomb was produced at the Los Alamos, N.Mex., laboratory and successfully tested on July 16, 1945.tomic bombs were subsequently developed by the USSR (1949; now Russia), Great Britain (1952), France (1960), and China (1964). A number of other nations, particularly India, Pakistan, Israel, and North Korea now have atomic bombs or the capability to produce them; South Africa formerly possessed a small arsenal.
  The first Atomic Bomb (called little boy) dropped was on  August 6, 1945 on the city of Hiroshima. The second atomic bomb  (called fatman) dropped was on Nagasaki three days later.  The United States dropped these bombs on Japan in order to end  World War II.Then on August 14, 1945, the Japanese surrendered.he was ended  only 1 day after the second bomb was dropped. The bombs caused  Japan to surrender. Both a-bombs (atomic bombs) caused about  128,000 people to die and over 120, 000 people suffered from  radiation sickness and cancer.