Periodic Table

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Across
  1. 2. the chemical element of atomic number 26
  2. 3. electron: outer shell electron that is associated with an atom
  3. 6. Without a charge
  4. 7. a stable subatomic particle with a positive electric charge
  5. 8. number the number of protons in the nucleus of an atom.
Down
  1. 1. a negatively charged ion
  2. 4. Subatomic particle with a negative charge
  3. 5. a positively charged ion
  4. 9. number: total number of protons and neutrons in a nucleus