Atomic Structure

• What was Dalton's atomic theory?


  All matter is made up of atoms, Atoms cannot be created, divided, or destroyed, All atoms of a certain element are identical but different from atoms of other elements, Atoms join with other atoms to make new substances.
• What was JJ Thompson discovery?


  He discovered electrons and said that they were 2000x less mass than the smallest atom. The electron carried electricity and was negatively charged.. Thompson said that these electrons were inside on a bigger positively charged atom

  
• What was Ernest Rutherford gold foil experiment and discovery?


  Rutherford fired alpha particles at a gold foil. The alpha particles were denser than the gold so when the alpha particles hit the gold foil, the alpha particles should pass through the gold however some alpha particles bounced back which meant that an atom has a nucleus which was surrounded by electrons

  
• What was Chadwick's theory


  Chadwick carried out a series of experiments and confirmed the existence of a neutral particle called the neutron

  
• What is a isotope?


  An atom with the same number of protons, different number of neutrons

  
• What is mass number?


  Number of protons and neutrons
• What is a ion


  an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.