A Hughes Chapter 9 test

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Across
  1. 1. gas shell - a region of space around the atomic nucleus within which electrons may reside
  2. 5. - an electrically neutral subatomic particle in the atomic nucleus
  3. 6. table - a chart in which all known elements are listed in order of atomic number
  4. 7. - a small, discrete packet of light energy
  5. 8. model - a representation of an object on the same convenient scale
  6. 9. - a vertical column in the periodic table; also known as a family of elements
Down
  1. 2. - any material that is made up of only one type of atom
  2. 3. model - a representation of a system that helps us predict how the system behaves
  3. 4. nucleus - the dense, positively charged center of every atom
  4. 8. - a positively charged subatomic particle in the atomic nucleus