Elijah's science crossword puzzle

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Across
  1. 3. a simple substance that cannot be broken down into smaller parts or changed into another substance
  2. 5. total of all protons,electrons and neutrons
  3. 7. an electromagnetic wave with a wavelength in the range 0.001–0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation
  4. 9. the smallest structural and functional unit of an organism
  5. 10. strength or energy as an attribute of physical action or movement
  6. 11. a subatomic particle with a positive electrical charge
  7. 12. the study of living organisms
  8. 14. the movement of light conceptualized as a wave, defined by such properties as reflection, refraction, and dispersion.
  9. 15. the scientific study of matter and its motion and behavior through space and time
Down
  1. 1. a state of matter along with solids, liquids and gases.
  2. 2. exists in the nucleus of the atom alongside protons and makes up an atom's atomic mass with protons.
  3. 4. A small particle with a negative charge that is found in all atoms
  4. 6. the rate of change of velocity per unit of time
  5. 8. smallest unit of element
  6. 13. the force that attracts a body toward the center of the earth