CHEMISTRY UNIT REVIEW CROSSWORD

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Across
  1. 2. a set of elements occupying an entire horizontal row in the periodic table
  2. 8. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
  3. 9. the number of protons in the nucleus of an atom
  4. 10. is composed of two or more separate elements
  5. 12. a group of atoms bonded together
  6. 13. an element that is not a metal
  7. 14. elements that have properties of both metals and nonmetals
  8. 17. occupying Group 0 of the periodic table
  9. 19. The number atoms presents before and after a reaction takes place is always the same.
  10. 21. a subatomic particle of about the same mass as a proton but without an electric charge
  11. 23. ingredients present before the reactions begins
  12. 24. substances that cannot be broken down into simpler substances
  13. 25. the absorption of heat
Down
  1. 1. a set of elements in a column having similar properties
  2. 3. regions of space outside the nucleus of an atom where an electron may exist.
  3. 4. electrons in the outermost shell of an atom
  4. 5. a stable subatomic particle occurring in all atomic nuclei
  5. 6. the letter or letters standing for a chemical element
  6. 7. the basic unit of a chemical element.
  7. 11. created a version of the periodic table of elements
  8. 15. ingredients produced after the reaction takes place
  9. 16. the mass of an atom of a chemical element
  10. 18. the release of heat
  11. 20. the positively charged central core of an atom
  12. 22. a stable subatomic particle with a charge of negative electricity