Periodic table

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Across
  1. 2. An atom with 4 electrons in its outer shell.
  2. 6. I have an atomic mass of 39.
  3. 7. name of element with the symbol "Ag"
  4. 8. Family name given to group VII elements.
  5. 12. horizontal rows of elements.
  6. 13. I can be found in period 3, group VII.
  7. 14. name of element with symbol "Cu"
  8. 17. Elements stored under oil.
  9. 18. smallest unit of an element that can exist.
  10. 19. Least reactive member of group II.
  11. 21. Chemical properties of elements depend on me.
  12. 23. Part of the atom with a positive charge.
  13. 25. arrangement of electrons on shells.
  14. 26. Alkali metal + water produces which gas.
  15. 28. This is the same as the number of protons.
Down
  1. 1. Group of metals with a valence of 2.
  2. 3. I am the most reactive metal in Group I.
  3. 4. The elements that make up the zig-zag line.
  4. 5. Alkali metal + water -> ____(name solution)
  5. 9. Vertical column of elements in the periodic table.
  6. 10. I am a liquid found on the periodic table.
  7. 11. I am found inside the nucleus of an atom.
  8. 15. Chart showing all the elements that exist.
  9. 16. Subatomic particle with a positive charge.
  10. 20. My electronic configuration is 2.8.2.
  11. 22. I have a mass number of 65.
  12. 24. Name of element with 10 protons and 10 electrons?
  13. 27. number of valence electrons for sodium.