atoms and periodic table

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Across
  1. 3. atoms are mostly ______ space
  2. 5. If an atom has in imbalance of electrons and protons it will have a ______
  3. 6. 2 elements with the same number of protons but different number of neutrons
  4. 8. Combination of protons and nuetrons
  5. 10. electrons found in the outer most shell are the ______ electrons
  6. 11. found in period 2 and group 16
  7. 12. found in period 2 and group 1
  8. 14. protons and neutrons make up the ________ of an atom
  9. 17. An element with a charge
  10. 19. What is found in an orbital around the nucleus
  11. 21. Charge of the neutron
Down
  1. 1. the first element on the periodic table
  2. 2. all elements in the same vertical column are in the same ________
  3. 4. Charge of the proton
  4. 7. generally found on the left of the periodic table
  5. 8. How many protons are in an element
  6. 9. atomic number is 11
  7. 13. all elements in the same horizontal row
  8. 15. atomic number is 6
  9. 16. generally found on the right of the periodic table
  10. 18. Charge of the electron
  11. 20. special name for the gases in group 18