DanielA 9L Crossword

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Across
  1. 3. positively charged particle in the nucleus of an atom
  2. 5. number of protons in the nucleus of one atom of an element
  3. 7. can be stretched into wire
  4. 8. shininess of a metal
  5. 9. ability to pound and roll into flat sheets
  6. 10. group 18 in periodic table, they are the most stable and nonreactive elements.
  7. 13. horizontal row of elements in the periodic table
  8. 14. Mass of Reactants= Mass of Products
  9. 17. chemical change that occurs when oxygen in the air reacts with a metal
  10. 19. substance that helps a chemical reaction proceed more quickly
  11. 21. at table in which elements are organized by their physical and chemical properties
  12. 23. a pure substance formed when two non metals combine
  13. 24. what everything is made of
  14. 25. workplace hazardous information material system
Down
  1. 1. invisible negatively charged particle that orbits the nucleus of and atom
  2. 2. chemical reaction that absorbs energy
  3. 4. Irreversible change
  4. 6. element that has both metallic and non metallic properties
  5. 11. chemical reaction that releases energy
  6. 12. the degree to which a specified material conducts electricity
  7. 15. metal the first column of the periodic table excluding hydrogen,that a really reactive in air and water
  8. 16. a pure substance formed when at least on metal and one non metal combine
  9. 18. catalyst involved in chemical reactions in living things
  10. 20. neutral particle in the nucleus of an atom
  11. 22. the mass of an element measured in amu