A Hughes Chapter 9 test

Edit Answers
123456789
Across
  1. 2. - a positively charged subatomic particle in the atomic nucleus
  2. 6. model - a representation of a system that helps us predict how the system behaves
  3. 8. gas shell - a region of space around the atomic nucleus within which electrons may reside
  4. 9. nucleus - the dense, positively charged center of every atom
Down
  1. 1. - a vertical column in the periodic table; also known as a family of elements
  2. 2. model - a representation of an object on the same convenient scale
  3. 3. table - a chart in which all known elements are listed in order of atomic number
  4. 4. - a small, discrete packet of light energy
  5. 5. - any material that is made up of only one type of atom
  6. 7. - an electrically neutral subatomic particle in the atomic nucleus