Periodic Table Crossword

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Across
  1. 2. element H20
  2. 5. particles in the nucleus with a positive charge of 1+
  3. 9. number the number of protons an atom has
  4. 11. the positively charged center of the atom
  5. 12. particles with a negative charge of a 1- that occupy the space around the nucleus
  6. 15. element H
  7. 16. element K
  8. 17. the "columns" on the periodic table
  9. 18. element C
  10. 20. atoms of the same element that have different numbers of nuetrons
Down
  1. 1. the "rows" on the periodic table
  2. 3. number sum of the portions and the number of neutrons
  3. 4. the most popular model for an atom
  4. 6. element NaCl
  5. 7. atoms are mostly____space
  6. 8. particles in the nucleus that are electrically neutral
  7. 10. element Ca
  8. 13. element Na
  9. 14. cloud area around the nucleus of an atom where electrons are most likely to be found.
  10. 19. the smallest particle of an element