The Periodic Table

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