Structure of matter

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Across
  1. 5. table of elements a tabular display of the chemical elements
  2. 8. a row of chemical elements
  3. 9. a chemical substance that combines two or more elements
  4. 10. a subatomic particle with a negative charge
Down
  1. 1. the number of protons found in the nucleus
  2. 2. the smallest unit of matter
  3. 3. a column in the periodic table
  4. 4. a subatomic particle with a neutral charge
  5. 5. a subatomic particle that has a positive
  6. 6. an electrically neutral group of two or more atoms
  7. 7. a pure substance consisting only of atoms