Mind games

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Across
  1. 2. relating to the nucleus of an atom.
  2. 4. present as the strongest or main element.
  3. 9. remaining the same in all cases and at all times; unchanging in form or character.
  4. 10. gather together or acquire an increasing number or quantity of.
  5. 12. made, done, happening, or chosen without method or conscious decision.
  6. 14. bring back (a previous right, practice, custom, or situation); reinstate.
  7. 15. succeed in persuading or influencing (someone) to do something.
  8. 17. with the addition of.
  9. 18. (especially of change or action) relating to or affecting the fundamental nature of something; far-reaching or thorough.
Down
  1. 1. a consideration or amount that diminishes or balances the effect of a contrary one.
  2. 3. decisive or critical, especially in the success or failure of something.
  3. 5. cease to support or look after (someone);
  4. 6. bring to an end.
  5. 7. handle or control (a tool, mechanism, etc.), typically in a skillful manner.
  6. 8. an exciting, emotional, or unexpected series of events or set of circumstances.
  7. 11. occurring at the end of or as a result of a series of events; final; ultimate.
  8. 13. (especially of a muscle or someone's body) stretched tight or rigid.
  9. 16. publicly display (a work of art or item of interest) in an art gallery or museum or at a trade fair.
  10. 18. re-examine and make alterations to (written or printed matter).
  11. 19. abandon (a person, cause, or organization) in a way considered disloyal or treacherous.
  12. 20. a sheet of information in the form of a table, graph, or diagram.