The Periodic Table

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1234567891011121314151617181920
Across
  1. 2. number of post transition metals
  2. 5. all of group 17
  3. 8. number of families
  4. 11. neutral subatomic particles
  5. 14. number of metalloids
  6. 16. element that shares the name of the 1st planet from the sun
  7. 17. most reactive metals
  8. 18. mostly gases and can be found on the right side of the periodic table.
  9. 20. the sum of the protons and neutrons in the nucleus.
Down
  1. 1. horizontal rows of elements arranged by increasing atomic number
  2. 3. vertical columns of elements with similar properties.
  3. 4. properties of both metals and non-metals
  4. 6. tells us the number of protons AND Electrons in an element
  5. 7. take up most of the periodic table
  6. 9. most reactive element
  7. 10. negative subatomic particles
  8. 12. 1 or 2 letters that represent the name of the element.
  9. 13. positive subatomic particles
  10. 15. most unreactive gases
  11. 19. number of periods