periodic table

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Across
  1. 5. this family is non reactive and contains the element Kr
  2. 7. most reactive non-metal family and the 2nd most reactive family
  3. 8. most reactive family and contains the element Cs
  4. 9. do not add mass to the atom
  5. 13. the number of negatively charged atoms in the outermost shell or the orbital
  6. 16. composed of 2 or more compounds physically combined
  7. 17. a substance made of 2 or more elements chemically combined
  8. 18. will never change, because if you change the number of them the atom will change
  9. 19. combine 2 liquids and form a solid. it is always a chemical change
  10. 20. pure substance that cannot be broken down into something simpler by chemical means
Down
  1. 1. all the elements to the left of the staircase line
  2. 2. atoms will always react until they have a full shell
  3. 3. an electrically charged element formed from the movement of electrons
  4. 4. touching the staircase line
  5. 6. the elements are all arranged on this
  6. 10. created the modern periodic table
  7. 11. total number of protons and neutrons in an atom
  8. 12. tells the number of protons
  9. 14. everything to the right of the staircase line
  10. 15. add mass to the atom