Periodic Table Crossword Puzzle

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Across
  1. 6. Elements in period seven have how many shells?
  2. 7. Group One is filled with which type of metals?
  3. 8. The atomic number is the number of what subatomic particle?
  4. 10. What is the name of the elements in group 17?
  5. 13. What subatomic particle determines the reactivity of an atom?
  6. 15. The columns of the periodic table are called?
  7. 18. The rows of the periodic table are called?
  8. 19. What element has the highest atomic radius?
Down
  1. 1. First element on the periodic table?
  2. 2. All elements in a row have the same number of electron _____?
  3. 3. Elements in the same group have similar?
  4. 4. The electrons on the outermost ring are called _____ electrons.
  5. 5. Scientist who created the periodic table?
  6. 9. The D block is filled with which type of metals?
  7. 11. Protons and ______ make up the mass of an atom.
  8. 12. How many valence electrons does group 14 have?
  9. 14. Elements in group 18 are called _______ gases.
  10. 15. Noble ______ are the least reactive.
  11. 16. What is the symbol of silicon
  12. 17. Atomic mass is measured in what?