Atoms and the periodic table

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Across
  1. 3. The columns in the periodic table that give us the valence electrons up until the 20th electron in a pattern
  2. 5. How reactive the element is
  3. 7. second family of periodic table and has 2 valence electrons
  4. 11. Subatomic particles within the nucleus that, when added to the number of protons, gives the atom it's atomic mass and has a negative charge
  5. 12. Subatomic particles within the nucleus that gives the atom it's atomic number and has a positive charge
  6. 14. last family of the periodic table with 2 valence electrons for the rest electron and 8 valence electrons for the rest
  7. 16. first family of the periodic table and has 1 valence electron
  8. 18. center of the atom containing protons and neutrons
  9. 19. fourth family of the periodic table with 4 valence electrons
  10. 21. The clouds/energy levels surrounding the nucleus that contain the electrons
Down
  1. 1. the first row of elements at the bottom of the periodic table
  2. 2. the seventh family of the periodic table and has 7 valence electrons
  3. 4. the second row of elements at the bottom of the periodic table
  4. 6. The outermost electron/electrons of an atom
  5. 8. sixth family of the periodic table with 6 valence electrons
  6. 9. third family of the periodic table and doesn't follow the rule of valence electrons
  7. 10. The rows in the periodic table that give us the electron clouds/energy levels through the whole periodic table
  8. 13. fifth family of the periodic table with 5 valence electrons
  9. 15. Subatomic particles surrounding the nucleus with a negative charge, an atom has the same number of these as it does protons
  10. 17. Patterns in the periodic table
  11. 20. within the atom