Kobey Brewster ch.9 science crossword

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Across
  1. 2. a representation of an object on some convenient scale
  2. 3. any material that is made up of only one type of atom
  3. 5. any subatomic particle found in the atomic nucleus; another name for either a proton or neutron
  4. 7. a chart in which all known elements are listed in order of atomic number
  5. 9. the dense, positively charged center of every atom
  6. 10. a positively charged subatomic particle in the atomic nucleus
Down
  1. 1. a representation of a system that helps us predict how the system behaves
  2. 4. a count of the number of protons in the atomic nucleus
  3. 6. an electrically neutral subatomic particle in the atomic nucleus
  4. 8. a vertical column in the periodic table; also known as a family of elements