Periodic Table Crossword Puzzle

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Across
  1. 5. what is the first coinage element
  2. 8. What is the heaviest actinide
  3. 9. What is a variation of a element called
  4. 11. What is the separating staircase called
  5. 12. name for needing eight valence electrons
  6. 13. Positive ions have_protons than electrons
  7. 15. what defines the different types of isotopes in a element
  8. 16. 5th group, 7th period
  9. 17. what element has the abbreviation of Tc
  10. 18. avg mass of 114.818
  11. 19. what block is Sm in
Down
  1. 1. what is the name of group 1
  2. 2. standard measurement for mass
  3. 3. group 17 name
  4. 4. what is the same as atomic number
  5. 5. what is the hyphen notation of chlorine
  6. 6. what’s another name for period number
  7. 7. vertical organization of valence electrons
  8. 10. Germanium has how many valence electrons
  9. 14. What is chlorine 24