history of atom/ periodic table

• Complete the order of discovery (words: electron, neutron, proton)

  • electron
  • proton
  • neutron
• Who discovered the electron?

  JJ Thompson
• Who proved that there were neutrons?

  James Chadwick
• In what year was the Bohr Model made?

  1913
• What year was the existence of the neutron proved?

  1932
• When did Rutherford conduct his famous experiment?

  1909
• Who created the plum pudding model?

  JJ Thompson
• Who created the nuclear model of the atom (1909)?

  Rutherford
• What did Niels Bohr suggest about electrons?

  They are arranged in fixed shells
• What did the plum pudding model suggest?

  An atom is a spherical cloud of positive charge with negatively charged electrons in it
• What did Rutherford discover?

  The nucleus
• Who made the periodic table that is accepted today?

  Dmitri Mendeleev
• Why did Mendeleev leave gaps in the period table?

  He knew there were undiscovered elements
• Why did early scientists use atomic weight instead of number?

  Protons, neutrons and electrons were not discovered yet
• How do isotopes explain why atomic weights didn't give the correct order of elements?

  Isotopes have a different mass but the same chemical properties
• Why is it called the periodic table?

  Because of patterns in chemical properties