States of matter

• What was Thomsons plum puddings?

  1897

  Ball of positive charge

  Negatively charged electrons mixed in
• What was Ernests Rutherford model?

  Alpha particles could bounce back off of atoms

  atoms mass is concentrated in atoms centre

  nucleus contains positive charged particles (protons)
• What was Niels Bohr's model?

  Electrons orbit the nucleus at fixed distances
• Rutherfords experiment: what did most of the alpha particles do?

  Passed straight through

  Suggests the atom is mostly empty space
• What did the atoms that bounced back in Rutherfords experiment show?

  There was some positively charged mass in the atom was repelling the positive particles
• What did the small amount of atoms that came straight back mean in Rutherfords experiment?

  the positive charge and mass are in a small volume