- 
  
  the gadget was tested at trinity site,new Mexico near Alamogordo
 - 
  
  the first atomic bomb dropped over the Japanese city of Hiroshima.
 - 
  
  The first,Little Boy, was a gun type weapon with a uranium core.
 - 
  
  The second weapon, dropped on Nagasaki, was call fat Man and was an implosion type device with a plutonium core.
 - 
  
  An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons,and electron.