Matter & Energy crossword

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Across
  1. 5. a table of the chemical elements arranged in order of atomic number
  2. 6. a series of interactions in which one organism eats another to gain energy
  3. 10. two or more atoms joined (bonded) together chemically
  4. 11. the law that states matter cannot be created or destroyed
  5. 13. the number of protons plus the number of neutrons contained in an atom's nucleus
  6. 14. the ability to move heat or electricity from one place to another
  7. 15. a pure substance that cannot be broken down chemically
  8. 17. the number of protons or electrons contained in an element
  9. 18. elements located to the right of the stair-step (zig zag) line on the periodic table
  10. 20. a diagram that shows many overlapping food chains
  11. 22. neutrally-charged subatomic particles found in the nucleus
Down
  1. 1. a substance that consists of 2 or more elements combined in a set ratio
  2. 2. a diagram that shows the amount of energy moving from one feeding (trophic) level to the next
  3. 3. elements or compounds on the left side of a chemical reaction (what you start with)
  4. 4. the amount of space an object occupies
  5. 7. the type of change that results in the formation of new chemical substances
  6. 8. elements or compounds on the right side of a chemical reaction (what you produce)
  7. 9. the ratio of an object's mass to its volume (M/V)
  8. 12. the type of change in which the form (appearance) of matter is altered but one substance is not changed into another
  9. 15. negatively-charged subatomic particles found in a cloud surrounding the nucleus
  10. 16. two or more substances that are together but not chemically combined
  11. 19. the center of an atom that contains the protons and neutrons
  12. 21. positively-charged subatomic particles found in the nucleus