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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.
Names of Atom (or atomic) bombs Little Boy uranium 235 atom bomb dropped by Enola Gay piloted by Colonel Paul Tibbets, on Hiroshima Fat Man plutonium 239 atom bomb als â¦ o dropped by Bockscar piloted by Charles W. Sweeney instead of the Bockscar's normal pilot Frederick Bock over Nagasaki.hat was the name of the first atomic bomb that US dropped on Japan? The first bomb that was dropped was code named 'Little Boy' it was dropped on Hiroshima on the 6th Aug 1945, and the second was code named 'Fat Man' and it was dropped on Naga â¦ saki on the 9th Aug 1945.