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6. In the modern periodic table, how are elements arranged?

  • Decreasing atomic number
  • Decreasing atomic mass
  • Increasing atomic number
  • Increasing atomic mass

7. Which of these statements is true?

  • Protons have a positive charge, electrons negative, neutrons are neutral
  • Protons have a positive charge, neutrons negative, electrons neutral.
  • Electrons have a positive charge, neutrons neutral, protons positive
  • Neutrons have a positive charge, electrons negative, protons neutral

8. What did Mendeleev do with elements that hadn't been discovered?

  • Nothing, he didn't think there would be any
  • Left a long gap along the top for them
  • Left gaps
  • Filled them in by predicting their properties

9. In which year did Mendeleev arrange the elements into a Periodic Table?

  • 1869
  • 1986
  • 1896
  • 1689