Atom & Photosynthesis vocab - Crossword puzzle

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Across
  1. 4. ______ measures how large an object is.
  2. 5. An ______ has a negative charge.
  3. 6. ______ open to allow gases to enter leaves.
  4. 8. A ______ has a positive charge.
  5. 9. _______ takes energy from the sun.
Down
  1. 1. ________ provides energy to living cells.
  2. 2. An electron orbits the atomic ______.
  3. 3. A ______ carries no electrical charge
  4. 4. Plants store excess sugar as ______.
  5. 7. An ______ is the basic building block of matter.