Chemistry Study Guide

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