Chemistry Study Guide

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Across
  1. 2. a representation of an element
  2. 4. collumns on the P.T. table (18 collumns)
  3. 8. central part (core) of the atom, contains protons and neutrons
  4. 10. something made up of 2 or more different elements
  5. 12. shares characteristics of both metals and non-metals
  6. 13. atoms in the outermost orbital
  7. 18. the result of the reaction. Right side of chart
  8. 21. a smallest part of an element
  9. 22. gas Group 18: He, Ne, Ar, Kr, Xe, Rn, maximum number of valence electrons
  10. 24. substances used to make products. Left side of chart
  11. 25. a group of atoms, small
Down
  1. 1. 1 substance in its pure form, can't be broken down any further
  2. 3. Greta conductors of heat and electricity, hard
  3. 5. the process of putting an outer coating on sowmthing to make the object last longer
  4. 6. rows on P.T., atomic number increases from left to right
  5. 7. neutrally charged atoms
  6. 9. the number of protons atom
  7. 11. chemist who created P.T. Table
  8. 14. the number of protons within an atom
  9. 15. reaction when energy is being absorbed; makes substance colder
  10. 16. negatively charged atoms
  11. 17. far right in P.T. not good conductors of neat or electricity, brittle
  12. 19. (2,8,8,2) electron density
  13. 20. of Conservation of Mass nothing is created nor destroyed by chemical reactions or physical transformations.
  14. 23. positively charged atoms
  15. 26. reaction when energy is being released; makes substance warmer