titanium

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Across
  1. 7. negative charge
  2. 8. greater than zero
  3. 9. no charge
Down
  1. 1. less than zero
  2. 2. table: table with chemical elements
  3. 3. type of metal
  4. 4. a part of a whole
  5. 5. positive charge
  6. 6. smallest thing in the world