Cross Word Puzzle

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Across
  1. 3. hard to find or not common
  2. 6. the atomic number of ytterbium
  3. 7. element number 7
  4. 8. vertical grouping on period table
Down
  1. 1. ability to be drawn into wire
  2. 2. ability to be tuned into a sheet
  3. 4. the type of element ytterbium is
  4. 5. horizontal grouping on periodic table