Gr 8, Extra Credit - Elements, Compounds, and Mixtures Crossword

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Across
  1. 6. elements are represented by _____ on the periodic table
  2. 7. a molecule is the smallest unit that retains the _____ of a compound
  3. 12. formula for table salt
  4. 13. when a compound is formed, a _____ _____ takes place
  5. 14. silicon is a major part of the earth's _____
  6. 15. organized elements into a periodic table
  7. 16. this element makes up approximately 80 percent of earth's atmosphere
  8. 18. substance whose formula is H2O
  9. 19. any two or more atoms bonded together
Down
  1. 1. compounds are represented by these
  2. 2. an element cannot be _____ _____ into any other substance
  3. 3. two or more different types of atoms bonded together
  4. 4. to determine the number of elements in a molecule, you need to count the _____ _____
  5. 5. the building blocks of matter
  6. 8. this element is used to add strength to glass
  7. 9. the parts are easy to separate by physical means
  8. 10. this is formed when a chemical reaction takes place
  9. 11. atoms with the same atomic number
  10. 13. _____ and oxygen make up a large proportion of living matter
  11. 17. this is the most common element in the ocean