Atoms & the Periodic Table

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Across
  1. 4. one-, two-, or three-letter abbreviation used to represent an element or its atoms
  2. 6. Horizontal row in the Periodic Table
  3. 9. negatively charged, subatomic particle of relatively low mass located outside the nucleus
  4. 10. electrically charged atom or molecule (contains unequal numbers of protons and electrons)
  5. 11. positively charged, subatomic particle located in the nucleus
Down
  1. 1. sum of the numbers of neutrons and protons in the nucleus of an atom
  2. 2. number of protons in the nucleus of an atom
  3. 3. Vertical Column in the Periodic Table
  4. 4. positively charged atom or molecule (contains fewer electrons than protons)
  5. 5. atoms that contain the same number of protons but different numbers of neutrons
  6. 7. negatively charged atom or molecule (contains more electrons than protons)
  7. 8. uncharged, subatomic particle located in the nucleus