development of the model of atoms

• what is daltons model?

  atom is a solid sphere that cannot be created or destroyed
• What is the plum pudding model created by JJ thompson?

  a ball of positive charge with negative electrons embedded in it
• what was rutherfords alpha scattering experiment?

  fired alpha particles at thin sheet of gold

  most passed straight through others were deflected
• why did some deflect and others pass through in the alpha scattering experiment?

  mass of an atom is concentrated in a central nucleus that is +charged and most atoms were empty spac
• why did rutherfords alpha scattering experiment overthrow the plum pudding?

  if plum pudding were true all atoms would bounce back
• who came up with the electron shell model?

  Bohr
• who discovered the neutron?

  chadwick