Periodic trend

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Across
  1. 4. the ability to attract shared electrons
  2. 7. when an atom gains an electron from a negative ion causing an energy change
  3. 9. the opposite of a positively charged ion
Down
  1. 1. is the process by which an electrically charged particle becomes an ion
  2. 2. the energy needed to remove an electron
  3. 3. the opposite of a negatively charged ion
  4. 5. in the outermost electron shell
  5. 6. the dimensions of an atom's size
  6. 8. is an atom or molecule that has gained or lost electrons