The definition of “Atomic Theory is a theory of the nature of matter: all materials and substances are composed of tiny particles or atoms of a relatively small number of types and all atoms of the same type are uniform in size, weight, and other properties” (Merriam-Webster). When you hear the words "Atomic Theory", you associate words and people like the atom with the Greek philosopher Democritus, motion with Isaac Newton, the periodic table with Dmitri Mendeleev, "The Manhattan Project" with Albert Einstein (Buescher, 1996) but Does John Dalton meet when he talks about the "atomic theory"? Not likely, unless you have taken a college-level science or chemistry course. John Dalton is a man who had a great impact on the field of chemistry without his contribution. According to the “atomic theory”, our modern technology and science would never be the same. Without John Dalton, we will never know if GJ Stoney managed to discover the "electron" or Wilhm Roentgen discovers "X-rays", or Marie Slodwka Curie discovers "radioactivity", Albert Einstein discovers "E=MC^2", " or the completion of the "Periodic Table" by Dmitri Mendeleev (Buescher,