[DOC] [TLE] Hiroshima, Nagasaki & the First Atomic Bombs - Live Science [PAR] May 9, 2014 ... The first atomic bombs were detonated during World War II. First, a test bomb 
exploded in the New Mexican desert. ... By the summer of 1945, World War II had 
raged across several continents for six years, ... two different bombs that used two 
different nuclear materials: uranium-235 and plutonium-239. [DOC] [TLE] atomic bomb | fission device | Britannica.com [PAR] Apr 29, 2016 ... Weapon with great explosive power that results from the sudden release of ... of 
the nuclei of such heavy elements as plutonium or uranium. ... The first atomic 
bomb test, near Alamogordo, N.M., July 16, 1945. ... When a neutron strikes the 
nucleus of an atom of the isotopes uranium-235 or plutonium-239,... [DOC] [TLE] Hiroshima, Nagasaki and Subsequent Weapons Testing - World ... [PAR] Information on the Hiroshima and Nagasaki Atomic bombs and subsequent ... UK
) from uranium-235 and plutonium-239 were dropped on Hiroshima and 
Nagasaki ... techniques using the very small differences in mass of the two main 
isotopes: ... first used for a test explosion at Alamogordo in New Mexico on 16 
July 1945,... [DOC] [TLE] Trinity (nuclear test) - Wikipedia [PAR] Trinity was the code name of the first detonation of a nuclear weapon, conducted 
by the United States Army at 5:29 am on July 16, 1945, ... Plutonium is a synthetic 
element with complicated physical, chemical and metallurgical properties. ... He 
discovered that, in addition to the plutonium-239 isotope, it also contained... [DOC] [TLE] Manhattan Project - Atomic Bombs [PAR] U.S. government research project (194245) that produced the first atomic 
bombs. ... By the summer of 1945, amounts of plutonium 239 sufficient to produce 
a nuclear ... or fission, of the nuclei of such heavy elements as plutonium or 
uranium. ... One bomb, using plutonium, was successfully tested on July 16, 1945
, at a site... [DOC] [TLE] Atomic Timeline | Atomic Heritage Foundation [PAR] May 1934Enrico Fermi and his team in Rome bombard elements with neutrons 
.... arguing that the isotope of element 94 with 239 nucleons, not yet discovered, 
.... During the summer the group develops the principles of atomic bomb design, 
and ...... 1945 May 31Critical mass tests with plutonium begin at Los Alamos, NM. [DOC] [TLE] Manhattan Project - New World Encyclopedia [PAR] The Manhattan Project produced two atomic bombs that essentially ended the 
war ... nuclear weapons in 1945: A test detonation of a plutonium implosion bomb 
on July 16 (the Trinity test) near Alamogordo, New Mexico; an enriched uranium 
bomb ... be induced in stable elements by bombarding them with alpha particles. [DOC] [TLE] The Story of the Atom Bomb [PAR] This atomic fission was accompanied by the release of stupendous nuclear 
energy .... Isotopes, as you know, are atoms of the same element having the 
same atomic .... He rushed to Princeton to talk the matter over with his friend 
Eugene P. ...... This test explosion took place at 5:30 am, July 16, 1945, at the 
Alamogordo Air... [DOC] [TLE] Manhattan Project facts, information, pictures | Encyclopedia.com ... [PAR] In certain elements, such as plutonium-239, the fragments release other neutrons 
which ... secret United States project to investigate the potential development of 
atomic weapons. ... On July 16, 1945, a plutonium test bomb code named Gadget 
was detonated in a remote ... Secret Race Won with Chicago's Chain Reaction"... [DOC] [TLE] Nuclear Bombs, Ec - CollegeTermPapers.com [PAR] Accordingly, with the discovery of the new element plutonium (in particular, the 
Pu-239 ... Trinity test conducted at Alamogordo, New Mexico, on July 16, 1945--
and an ... Pu-239 is accompanied by the isotope Pu-240, which has a 
spontaneous fission ... Just after the dropping of the Atomic bomb on Japan in 
1945, nuclear... [DOC] [TLE] Boyce D. McDaniel, Cornell physicist who gave first atomic bomb ... [PAR] May 15, 2002 ... By the summer of 1945, enough U-235 (an isotope, comprising only ... On July 15
, 1945, the plutonium bomb was ready for its test at

Question: Using Pu-239, an isotope of this element, the atomic bomb was tested at Alamogordo in the summer of 1945
Answer: plutonium