Atomic structure 1

• What is the charge of a proton?

  +1
• What is the charge of a electron?

  -1
• What is the charge of a neutron?

  0
• What is the relative mass of proton?

  1
• What is the relative mass of electron?

  0
• What is the relative mass of neutron?

  1
• How many electrons in the first shell?

  2
• How many electrons in the last outer shell?

  8
• The order of the history of the atom:

  1. Simple atom (1800)
  2. plum pudding model (1897)
  3. nuclear model (1909)
  4. Orbital model (1913)
  5. modern atomic structure (1920s)
• What was the Plum Pudding model?

  JJ. Thomson

  Solid sphere with a weakly positive charge. Negatively charged electrons embedded.
• What was the nuclear model?

  Rutherford