Aden Thompson' crossword puzzle

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Across
  1. 2. number of protons an element has
  2. 7. columns on the periodic table
  3. 9. a table with all the elements
  4. 10. the rows on the periodic table
  5. 11. a bunch of the same atoms together not bonded
Down
  1. 1. has more than one different element
  2. 3. has no charge
  3. 4. smallest unit of matter
  4. 5. has a positive charge
  5. 6. has a negative charge
  6. 8. a group of atoms bonded together