Atoms, Elements And Compounds

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Crossword Hints
  1. unit of matter
  2. middle of atom
  3. proposed atoms have positive charges in their nucleus
  4. symbol for Uranium hexafluoride
  5. sodium symbol
  6. flying around the atom
  7. pure substance
  8. melting point of sodium
  9. neutral charge
  10. contains two or more elements
  11. first used theory of atoms