Periodic Table Crossword Puzzle

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Across
  1. 6. chemical element with symbol H and atomic number 1
  2. 8. positive
  3. 9. very dense region consisting of protons and neutrons at the center of an atom
  4. 11. milk of magnesia
  5. 13. negative
  6. 14. set of data values of a particular simple type
  7. 19. chemical element with the symbol Fe
  8. 20. colorless, odorless monatomic gas under standard conditions
Down
  1. 1. dense, soft, shiny, malleable and ductile metal
  2. 2. chemical element with symbol Fr and atomic number 87
  3. 3. number of protons found in the nucleus of an atom
  4. 4. basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons
  5. 5. chemical element with symbol Cl
  6. 7. neutral
  7. 10. metallic chemical element with the chemical symbol Ag
  8. 12. has 92 protons and 92 electrons, of which 6 are valence electrons
  9. 15. chemical element with symbol O and atomic number 8
  10. 16. chemical element with the chemical symbol Ni
  11. 17. It is a main group metal in group 14 of the periodic table
  12. 18. atomic number 30