Atoms and Chemical Reactions

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Across
  1. 4. sum of the protons and neutrons in the atom
  2. 5. the rows in the periodic table
  3. 8. smallest particle of an element
  4. 11. a chart showing all of the elements arranged according to the repeating pattern off their properties
  5. 12. atoms with the same number of protons, but different number of neutrons from other atoms of the same element
  6. 13. particle with no charge
Down
  1. 1. the number of protons in the nucleus of the atom
  2. 2. dense, positively charged center of an atom
  3. 3. a one or two letter abbreviation for an element
  4. 6. elements in the same vertical column of the periodic table; also called family.
  5. 7. negatively charged particle
  6. 9. the average mass of all the isotopes of that element
  7. 10. positively charged particle