Matter

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Across
  1. 2. Space and weighted
  2. 5. number:Nuclear
  3. 6. Nuclei
  4. 8. A substance
  5. 9. thermonuclear number
Down
  1. 1. Subatomic
  2. 3. Core
  3. 4. Lepton particle family
  4. 6. Molecule
  5. 7. Particles