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6. Protons & electrons have electric charges that are...

  • Equal, but opposite
  • Equal, but same
  • Unequal and opposite
  • Unequal and same

7. What is the BEHAVIOUR of an atom fixed by?

  • Nucleus
  • Nuetrons
  • Protons
  • Atomic number

8. Atoms consist of...

  • Protons, neutrons, electrons
  • Neutrons, nucleons, electrons
  • Protons, isotopes, electrons
  • Protons, nucleons, electrons

9. What can stop an alpha particle? (penetration)

  • 10-16 cm of air / 2 sheets of paper
  • 4-10 cm of air / 4 sheets of paper
  • 4-10 cm of air / 1 sheet of paper
  • 10-16 cm of air / 1 sheet of paper