The Periodic Table

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Across
  1. 1. particle in the nucleus of an atom with no electrical charge
  2. 3. the rows in the periodic table
  3. 5. a chart showing all of the elements arranged according to the repeating pattern of their properties
  4. 7. the number of protons in the nucleus of an atom
  5. 9. dense center in the atom with a positive charge
  6. 10. average mass of all isotopes in the element
Down
  1. 2. negatively charged particles inside an atom
  2. 4. a positively charged particle in an atom's nucleus
  3. 6. the smallest particle that can still be considered an element
  4. 8. one or two letter abbreviation for the element