Structure of matter

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