Atomic Models and Theory

• Atoms are the building blocks of matter that makeup everything that exists in our world.
• John Dalton


  • introduced the atomic theory into chemistry
  • research into color blindness
• 1803


  When did John Dalton introduced the atomic theory of matter?
• Father of Chemical Theory


  Dalton is known as the?
• Daltonism


  A red–green color blindness is called?
• Law of Conservation of Mass, Law of Definite Proportions, Law of Multiple Proportions


  What are the three fundamental laws established by Dalton and other scientists of his time to support the Atomic theory?
• Law of conservation of mass


  in a chemical reaction , matter is neither created nor destroyed ; or more accurately, there is no detectable change in mass during an ordinary chemical reaction.
• Law of definite proportion 


  different samples of any pure compound contain the same elements in the same proportions by mass. In a compound, the constituent elements are always present by weight.
• Law of multiple proportions 


  the mass of one element that can combine with a fixed mass of another element are in a ratio of small whole numbers.
• The Law of conservation of mass was outlined by Antoine Laurent Lavoisier.
• Plum-pudding model


  In this atomic model, the atom were composed primarily of a very massive, positively charged blob. Embedded in this blob, like plums, were negatively charged electrons. The positive charges would tend to spread out as much as possible , and then the negative charges are

  distributed throughout the atom.
• Joseph John Thomson


  Who came up with the plum pudding model?
• Nuclear model


  In this atomic model, an atom was made up of a very dense, positively charged nucleus surrounded primarily by empty space, where the electrons can be found.
• Ernest Rutherford


  Who came up with the Nuclear model?
• gold-foil experiment


  • demonstrated atom's structure using alpha particles
  • explains that the electrons move about the nucleus, not in a fixed location
• planetary model


  In this model, electron had several possible orbits at different distances from the nucleus and that an electron had to be in one specific orbit(energy level) oranother but this could not exist between orbits.
• Niels Henrik David Bohr


  Who came up with the planetary model?
• Niels Bohr


  made foundational contributions to understanding atomic structure and quantum theory for which he recieved the Nobel Prize in Physics in 1922.