Chemistry 2nd Semester Assessment Review

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Across
  1. 2. when an atom has a different number of protons and electrons
  2. 4. charge of a proton
  3. 8. smallest piece of matter
  4. 10. go 'up and down' on the periodic table
  5. 13. atom material is positive with negatives sprinkled in
  6. 14. discovered the positive particle
  7. 15. charge of an electron
  8. 18. cannot be broken down into a more simple substance
  9. 19. this type of bond is always between two non-metals
  10. 20. atoms are all the same
  11. 21. the name given to electrons on the outermost energy shell
  12. 24. a model of an atom that contains only the outside electrons
  13. 25. gave us the term atomos
  14. 27. a negative ion
Down
  1. 1. protons plus neutrons
  2. 3. this type of bond is always between a metal and a non-metal
  3. 5. a model of an atom that shows ALL electrons of an atom
  4. 6. positives are in the center of the atom with negatives traveling in circles around the outside
  5. 7. charge of a neutron
  6. 9. a positive ion
  7. 10. in an ionic bond, this action is completed by the elements' valence electrons
  8. 11. the only thing that can be placed or changed when balancing a chemical equation.
  9. 12. in a covalent bond, electrons are ______
  10. 16. go 'side to side' on the periodic table
  11. 17. always equal to the element's number of protons
  12. 22. gave us the term neutron; most modern model
  13. 23. mostly on the right side of the periodic table
  14. 26. mostly on the left side of the periodic table
  15. 28. when an atom has a different number of protons and neutrons