Colin Smith Burkholder Chapter 9

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Across
  1. 1. A horizontal row in the periodic table.
  2. 4. A count of the number of protons in the nucleus.
  3. 8. The mass of an element's atoms.
  4. 9. A small, negatively charged subatomic particle found outside the nucleus.
  5. 10. A positive charged subatomic particle in the nucleus.
Down
  1. 2. Any material that is made up of only one type of atom.
  2. 3. A chart in which all known elements are listed in order by atomic number.
  3. 5. The dense, positively charged center of an atom.
  4. 6. A neutral subatomic particle in the atomic
  5. 7. A vertical column in the periodic table.